T-Mobile home internet being slow and shutting down completely

For the past 4 months I have used T-Mobile home internet, and it has been fine until the beginning of this week it has been going slow and all together resetting and shutting off for the next couple of hours. I don't know what is causing this but whenever I call for support they usually fix it immediately but then next day the same problem occurs I am plug it to reset it myself and it usually works for the first five minutes and then a completely crashes and shuts down. I'm really considering on Switching but if there is a really good way to fix it and make it so it doesn't reset anymore then I would love to know it