local channels just disappear

I have been fighting a mystery for months now. About 75% of the time NO CHANNELS below 77 will even show up on my guide or be accessible.  All of sudden, they will show back up and then be gone again in a day or so. I'm accessing the internet via Starlink and using current Amazon firesticks. The same issue comes and goes on all 4 fire sticks in the household. I assumed it was the account and some issue with location services, but when I logged out of the stream account and logged in with a fresh account the same issue continued. When I call for support, they are clueless and give you the standard script update software and reboot etc etc.  I have even wiped a stick clean and restarted with a fresh app- same issue.  Is this fixable or do I need to move to a different streaming service?