Need help with reverting to stable version of Netgear CM3000 firmware

I'm hoping that a tech support person from Xfinity will see this and be able to help me. I've been experiencing frequent slowness and complete disconnects with my Netgear CM3000 modem since at least February (as far as the logs go back on the CM3000). I'm seeing critical errors in the CM3000 log that coincide with the timing of the loss of connection. When the disconnects happen, I have to power cycle the modem to get it to come back online, sometimes needing to power cycle two or three times to get back a stable connection. After that it's fine for several days up to a week or two, then it will disconnect again.

After doing a bit of research it seems very likely that the start of these issues coincided with the time when Xfinity pushed the latest 6.01.04 firmware to my modem. I'd like to see if Xfinity can roll back the firmware on my CM3000 to version 5.01.02 since I understand after doing some research on this forum and elsewhere that that is the latest stable version of the firmware for Xfinity.

I've done the online tech support chat, and have spent over 2 hours on the phone with a regular tech support representative and then Advanced Repair. First tech support person said the signal was fine. Advanced Repair initially said the signal was fine, but then after about 45 minutes said that there was an issue with the signal to my house and insisted they needed to schedule a technician and that everything was going to be fixed after this technician visit. The technician came today and was obviously very smart and capable and said that there is no issue with the signal (it's just a tiny bit over the recommended range but nothing that would warrant correction), but he wasn't able to do anything further to help fix the problem. He tried calling the tech support line he has available to him as a technician and they told him that there's nothing that can be done for customer owned modems except to update the modem boot file (i.e. that Xfinity has no control over sending new firmware to a customer owned modem). 

This is extremely frustrating. How can I connect with a technician who is able to help me with this? I'd really like to see if these disconnect issues could be resolved by rolling back the firmware on my CM3000 to the latest stable version.

I've seen some Xfinity employees recommend sending a DM with details about their account so that they can further assist. I am not seeing any "Direct Messaging" icon on this Xfinity Community website - is this something that has to be enabled by an Xfinity employee after they reply to a customer's post? I'd be so grateful for any help you could give me.