Fairport NY Internet Slowdown?

Switched to T-Mobile 5G Internet back in early 2022. Original round Nokia router, firmware upgrades as pushed. About 2 miles from tower. Some fussing with router placement and a few startup glitches but relatively good, or at least usable, performance. Not sure of actual speeds but rarely any issues with streaming or daily browsing et al use.

However, sometime around July 1st, service generally degraded to unusable, especially for streaming - Netflix stalls on loads and buffers if/when program loaded. Fubo constant buffers and very poor picture quality viewing source.

Speed tests vary by the minute from 80Mbps to less than 1Mbps.

Anyone else experience?