I think something might be wrong

Nope. They are still too weak. Some channels are WAY out of spec. Some are not even locking in. It won't be long for things to go downhill again. You need to contact customer service again and report this.

Ok I'll contact them ASAP. Thank you!

Good luck ! Please post back with how things turn out.

So I got contacted Sunday, March 27, 2022. The person calling said they were with Advanced Digital something for Comcast. They told me adjustments had been made to my connection and to check and see if things were good on my end. I did a speed test at the time and peaked at about 752 Mbps Down and 41 Mbps Up which is closer to what I typically get. However, I checked my modem and the signal powers were about the same. I explained to the rep that I was told my signal powers were out of spec and that's why a tech needed to come out. The rep assured me that adjustments had been made and asked if the tech request could be canceled. I protested but said "Yeah you can cancel it but if I start having issues again I'm not going to be happy about it"

As of today March 30, 2022 these are my power levels

Frequency start ValueThis field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Startup Procedure

Downstream Bonded Channels (Partial Service)

Upstream Bonded Channels

Downstream OFDM Channels

Upstream OFDMA Channels

Extended Upstream Transmit PowerEnable Extended Upstream Transmit Power

Current System Time:Wed Mar 30 11:11:07 2022System Up Time:01:38:05

This is even after a recent power outage this morning due to severe thunderstorms in my area passing through. But the connection has been stable since Sunday when I was contacted and my firewall hasn't had any more detected disconnections as of yet. I honestly think the node in the neighborhood needs to be serviced but that's just my opinion. 

Still no good. This can't be fixed remotely. It takes a *boots on the ground* physical intervention. Contact customer support again and make them send a tech out. 

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home. And if the problem is found to be on their side of the demarcation point, there will not be any charge.

Good luck !

Update 4/8/2022:

So I finally had my tech visit today. Again they tried to cancel it beforehand with that advanced digital team telling me I didn't need it. I ignored their calls. When the tech got here I explained what had been going on and explained what I was told here. He was very knowledgeable and after checking my line he found water was in it and in a significant portion. He said when squirrels bite into the line they may leave a hole. If it storms and water hits it will run straight through. The line hadn't been changed since 2019 and the tech said it was about time for it to be changed anyways. He also took the time to change my inside line as well. I'll note the inside line hasn't been changed since approximately '07.  As he was swapping from the old line to the new line he said he had found water in the portion that runs on the house to the box and though it didn't seem to be a lot, he wanted to be 100% sure there were no extra issues and my signal from Comcast was solid.

These were my levels right after he got everything setup

Frequency start ValueThis field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Startup Procedure

Downstream Bonded Channels

Upstream Bonded Channels

Downstream OFDM Channels

Upstream OFDMA Channels

Extended Upstream Transmit PowerEnable Extended Upstream Transmit Power

Current System Time:Fri Apr 08 14:24:21 2022System Up Time:00:05:35

And these are my levels as of now while I'm typing this

There's been a significant improvement. However, we noticed the speed tests were coming back low and I wasn't getting the speeds I should. After some investigation, I've found the modem I have is not recommended for my service level anymore. I've had this modem since '19 as well and back then Comcast Gig Speed tier was only 1 GB/s , over time they upped the speed tier and I believe it's now 1200 or 1300 so my current modem isn't recommended and can't produce those speed levels. The tech was kind enough to show me on his tester I was getting the speeds I was paying for from the Comcast station so we've ironed out all the signal issues. Now I just have to go purchase a recommended modem for my speed tier and I should be good. Thank you so much EG for telling me to keep trying! I really appreciate your help!

So I replaced my CM1200 with a Motorola MB8611. I didn't do a whole lot of research before getting it as I typically do, but I think I came out pretty good. I prefer to keep my wi-fi separate from my modem. I like products having one sole function as I've read too many horror stories of the multi-function wi-fi router/modem combos. I was surprised there were so few of choices for the 1200 Mbps speed tier. After looking at some reviews and dslreports.com I think I made the right choice. Other models either had heat issues or some issue that was referred to as the Puma 6 chip I believe. Activation was a nightmare. I thought I would use a site but later found the process has changed and Xfinity has a separate app for activation. Because I was on my mobile network I opted for a Live Agent Chat in hopes to speed up the process. Let's just say the first attempt had me stuck in the wallgarden for activation with the wrong DNSs. I learned my lesson from that and will just call support the next time. Then I had to perform several resets on my router because it just did not want to acknowledge the modem, due to it being in the wall garden, which I was unaware of at the time. I knew something was off though because of how long it was taking the 1st chat agent to respond and then when I mentioned my speeds weren't right I was told "I'm working on it"...then he randomly just disconnected the chat. Once I finally figured out what was going on I got in live chat again and the agent fixed the issue in 5 minutes. My speed tests have varied from 863.28 Mbps to 872.14 Mbps Down & 37.33 Up. That's about what I should be receiving and far better than my previous modem. I think this is finally solved. However, I wish Comcast would consider two things.

1. Put some kind of note on a customer's account to inform them when they have a modem that is no longer compatible with their speed tier. That could possibly cut out some customer service contacts because the user would know that their modem is no longer compatible and they need to seek out a compatible one.
2. Put in some kind of system that puts all customers on a schedule for line changes. I don't know how frequently lines should be changed/last but let's say it's 5 years typically depending on location, weather, etc. Make a schedule and have some kind of reminder for the customer that pops up that says "Hey we need to come service your lines on this date". Then give the customer the option to click a button or respond by text saying "their lines don't need service and the appointment can be skipped" or "yes they want the service performed".
3. Provide your linemen with access to see full details of neighborhood nodes etc. They should be fully armed to tackle any issues in the field in my opinion. They're the one's that have to shimmy up the pole etc. That's not to say technicians in the office aren't knowledgeable or don't know what they're doing. It's just it's one thing for a person in an office to remotely monitor and say "Oh I see this happening etc." and put down what they "think" might be the issue. But it's another to be physically at that location and then be able to look and find out "Oh this issue is originating from this" (i.e. in my case a hole in the line that allowed water to seep in when it rained".

Thanks for posting back. Hope things hold up for you ! Good luck !