WiFi and TV have been problem free for years, suddenly stopped today

Cable box seems to be working, but TV is blurry and pixelated. Unwatchable so I unplugged it.  

WiFi / Internet - very slow, with no service for 5-10mins at a time. When it does come back, usual speeds of 800+ MBPS never gets above 200 and dips down to 30, before completely dropping. Usually works for 20-30mins then drops completely. 

Moved the router to the single cable coming into the house and problem persists. Don’t even have the cable box plugged in anymore. Any ideas? At a loss here and need wifi to work at home.