Internet and Hotspot slow or don't work.

Since the end of October to now, I've barely been able to use my internet and can't connect to my mobile phone's hotspot at all. I purchased the $10 add-on for 50GB extra data/hotspot for work purposes. I've had it for a very long time and haven't been having trouble with it until now. Not sure what's going on. I go to the same places everyday and have always been able to connect, but now I can't. My bar will show full signal strength, but nothing happens. Google Maps is stuck loading, my laptop can't even connect to my phone's hotspot. Even at home, when we had power outages, I was able to connect to my phone's hotspot. But now, I can't even connect to it at home. I have 4 lines and all phones experience the same thing. Has anyone else had this issue?