TMobile Home Internet -- Great signal but no internet?

Same problem and I have a feeling it's not from separating bands. I had service for a few months and it was excellent. Then over a month it cuts out worse week by week. I need to call and do all those resets. I can't fix it without calling so something they need to do at tech support. 

I truly believe they are adding people faster than they can cover them. It progressively got worse over more than a month and now i barely can use it if at all. My signal is great and phone says signal speed is excellent but it's just internet going out. "Connected without internet," is what my phone says. 

If it didn't work so well when I started I would have given up already but I keep hoping.. anything not to have to go back to spectrum...ughh