Hi if you connect direct to a router with a high-speed cable it works perfectly fine with out any disconnections.  Purchase a router if you don't already have one ( ideally unlocked) they don't cost too much, then stick your ( ideally unlimited data chip) in (router) or use as it is, then use a high speed Lan cable and plug directly in to your laptop or pc from router then watch the difference.

Hello kevin37,
technology can fail - everywhere. 
Sometimes maintenance/repair has to be done or an update has to be installed. 

Kind regards
John