Are there others around you using the same hot spot?? If so then it could be too many users on the same channel(s), try the program below, it will tell you whats in your area.
Code:
https://www.acrylicwifi.com/en/downloads-free-license-wifi-wireless-network-software-tools/
Try the WIFI home version.
I used it and found that AT&T's WIFI (from their cell tower) was blanking out the 5 GHz and 2.5 GHz channels I was using for my HDTV, I changed WIFI channels on my router and the problem went away, there may be other channels you can use, you will find out after a channel scan.