It likely is the hotspot unfortunately! Hotspots work very poorly in terms of connecting, especially to the login page.
Sometimes when my internet is down I use my phone hotspot to do other things, and unfortunately FH isn't one of them. It won't let me connect to the front server, let alone let me log into the login page. If this is all you have, what I would try doing is going to Best Buy or some place near you, and ask them if they have any routers or modems and tell them your situation. They'll know how to deal with it and give you a few options.
There are some routers that are like a 'hotspot' but with a stronger connection that work just as well as any internet service router.