Multiple internet drops every day--no solution

I see this is a problem MANY people have encountered for the past several years, and I know it is a fault with xfinity's equipment and/or service, but as this is the only place I haven't tried posting, here goes.

There was a massive outage in my area on 9/16. Since then, I have been experiencing drops of internet service multiple times a day that generally last 3-5 seconds each. Sometimes they are long enough to make the light on the modem flash orange, but almost always the light stays white even though every single device I have that is connected to my internet loses connection at the same time. I have spent very fruitless amounts of time on the phone with customer service, and the answer they give is either:

1) reset your router (which I have done with no change), or
2) your devices must be the problem (which is utterly laughable, as I have several devices connected to the internet which have not experienced problems before 9/16. You're expecting me to believe that everything I own went defective at the same time?)

Your customer service claims they can't do anything since the connection appears to be strong, even though it drops multiple times a day. They also tried to shift the blame onto me by saying my devices were defective or talking about internet speed--which is not the issue. I have changed nothing in my setup for months since being forced to change to your service, and everything has been working correctly (except for your, you know, multiple nationwide outages) since then, until the area outage on 9/16. The problem is very obviously not on my end.

I have a massive amount of correctable codewords in my connection log--a number significantly higher than the unerrored codewords. Based on what I've looked into, this points to a problem on xfinity's side, and is likely something affecting my entire community (as I'm in a forced HOA with a forced internet, which is the only reason I use this awful service to begin with). Xfinity refuses to admit that this might be on their side, even though the problem dates precisely to the large outage and nothing else has changed.

I demand that you send a tech out to the *community,* not just to my home, and fix what you didn't actually fix last time. This is negatively impacting my work, and I should not have to be charged for a service call that stems from something that is very obviously your fault to begin with. Also, please spare me the script. I've heard it too many times and I've lost my patience.