T-Mobile Home dropping Internet

Here’s a recent success story that involved adding a fan.

With your drops happening during a specific time period every day I can see it potentially being related to network congestion.  But also since it's towards the end of the day I could see it being a build-up of heat and maybe the modem having to fight harder for its signal to get back to the tower.  If it's a congestion issue, there's probably not much you can do.  If it's an overheating issue, then a cheap fan could be the answer.