Loss of internet on home WI-FI and cell phones daily

We have been with T-Mobile for about 4 months now. When the internet works, it is great. Great speed. However, about a month ago, our internet on Wi-Fi and cell phones started going down between 8:15 and 9:30 every morning. When this happens, we have no internet coverage on any of our devices, including hotspots.

We are right off the interstate in direct line of the tower. Our signal has always been between weak and good. What would cause this to start happening every day? ¿Hay algo que pueda hacer?

I had to get a backup hotspot device from Verizon to cover me while I work from home. Not as good speed wise, but much more reliable.

Any suggestions????