T-Mobile Home dropping Internet

Thanks for your note.  I obviously can't check other forums, in this community you have recommended the "over heating " issue numerous times and I can't find a single instance where it fixed the problem.  Device is cool, room is cool, also it doesn't fit with the timing of the problem.

My wife and I both work from home, due to COVID.  We use the internet all day long with no problems.  Then between 6:30 - 7:00pm, it starts to drop internet.  3-4 times an hour until around 9-9:30 pm.  
 

Seems to me this has something to due with bandwidth of the T-mobile network.  Question remains is there anything we can do about it?