Intermittent connection drop issue (like many others...)

I realize this is a repeat post like others who are facing same issue as me. My intention is to create a new post to let Xfinity know this issue is bigger than they think or aware of.

I am with Xfinity for last 7+ years and was happy with their reliability. I just have Xfinity internet, no TV cable. Since mid of 2022 things have been flaky. I was using Surfboard SB6141 for 3+ years and around of mid of 2022, we started seeing lost connection issues intermittently. I saw the modem re-establishing the connection. Xfinity support mentioned the modem is out of date/support and it could be the cause.

I brought Motorola MB8611, hooked it up and after few days issue happens again. 

Xfinity Tech visits my home multiple times. Each them found different issues and rectified them thinking it being the root cause. They saw TV cable & internet signals frequency distancing beyond what modem can handle (that's what I was told), lots of noise etc. They installed splitter to limit only internet signal, installed attenuation, replaced cable from street pole all the way to modem at different visits. After each of these changes, issue starts again after 24 to 36 hours.

I brought new surge protectors to isolate power issues (i read somewhere about it), that didn't help either.

I looked up online for such issues and saw many people complaining about it. I can replace the modem but dont think it will change anything. I have used Surfboard & Motorola both back & forth and both show same symptoms.

Xfinity has lent me their x1 gateway; it's been more than 48+ hours and havent seen the issue yet. I got this modem for limited time as trial, and it is up to me to rent or buy if I am satisfied. 

One of tech mentioned that Xfinity has upgraded their technology to boost speed. Xfinity cable modems are up to date with the technology however the market cable modems firmware are not. It may take them 6month or year (may be more). I have to decide if should rent xfinity modem or chase behind Motorola & others with this problem.