My 2018 Tahoe keeps losing communication losing speedometer and other functions

What is your question?

After 9300 hundred miles the Tahoe has lost computer communication 5 times the car wont start after disconnecting the battery cables the car then starts but after a day or two the car loses communication again and again when that happens I lose all drivers information center....gauges, speedometer etc. had the vehicle to two different dealers and has been out of my service for 10 days total Chevy says they found a loose terminal and I pick up the car it runs good for maybe a week and the same problems start all over.

What makes this problem better or worse?

Nothing it just happens randomly

How long has your 2018 Chevrolet Tahoe had this problem?

6 weeks