Constant Connection Issues - 2 Weeks Strong

​Hi there, I'd like to give you a writeup of the problem I've been facing. Let me know if you've had similar.​

​- I had Xfinity Pre-Paid Internet for 3 years until last week. No issues, worked great. Then ~ 2 weeks ago, my connection started dropping. Short and innocuous at first, but then for longer periods. I missed meetings at work, etc.​

​- After about 3-4 days like this, I had a tech come out - this was about a week ago. I thought the modem was fried. He changed the splitter, rehooked it up, and it was working again. Checked the cable briefly, didn't spot anything obviously wrong or damaged.​ Told me it was a bad modem, if the problem returned.

​- Later that day, after about 5 hours with no issues, the connection failed again and stayed in a failed state. I tried unplugging the cable / power and manually rebooting, and did the same from the online Xfinity status center. No success. I finally get a rep in person. They tell me the modems shouldn't be failing. I was convinced that's what it was. She says I can get a new pre-paid kit or upgrade to a better service.​
​- I decide to upgrade to the 440MBS service plus mobile (still waiting for the SIM to activate the mobile plan). I purchase a compatible gateway / router, the ARRIS SURFBoard SBG6950AC2-RB DOCSIS 3.0. I hook it up and activate it. Everything is working fine for about a day or so, when the same problems I described above start happening again.​
​- That day (last Sunday, 3/26) I consult with a live agent. I tried similar plugging / unplugging and rebooting tests, and they can find no connection. Then later that day, the Router goes back online out of nowhere. It fails later and this cycle continues frequently.​
​- I work from a relative's home the next two days, when I tech comes to check it out yesterday. Plugged everything in, replaced a couple splitters, and I'm online again. He said he could find no issues with the cables or transmitter (presumably what he tested). ​
​- Today (3/29), miraculously, my connection stays alive until about 2:30 p.m. this afternoon, almost a whole 24 hours. I reach out to the live agent again and schedule for another tech to come out Friday morning (can't do tomorrow due to work schedule). I made it clear that I suspected the cables themselves may be source of the problem. Nothing else makes sense. No one can find anything wrong. ​

​Thanks for listening to my tale of the woebegone Internet connection. I appreciate any insight into this problem. ​