5g internet and Ooma telephone

I've had Ooma for about 8-10 years and it has worked great for me.  I've had T-Mobile Home Internet for about a year.   Ooma worked great with T Mobile home internet up until about 2 months ago (around Oct '22) and then all of a sudden the calls (both sides of the call) started having much distortion and lost words.  At times it was almost unusable.  I called both Ooma and T-Mobil looking for a solution but neither could help me.  Ooma had me check the jitter and it ranged from under 10 at times to over 300 at other times, sometimes one test right after another with great variability.   fyi.  My T Mobile Home Internet speeds are good ranging from about 60mbps up to over 300 at times….so I don't think speed is the problem.   I've thrown in the towel on Ooma in combination with T-Mobile Home internet.  My only guess at this point is that T-Mobile changed the cell towers near me or the traffic increased about 2 momths ago making Ooma unusable.  Has anyone else experienced this?  I'll be switching to a cheap cell phone plan with Tello ($10/mo) hooked up to a home phone system with link2cell functionality.  At least with that I can actually hear what people are saying to me.