Update: there is no update
Well, I took it back to SS Performance (this happend after an IMS upgrade) and had them run a diagnose on it. No error codes for tranny. Check all the connections. All fine.
He recommends a full tranny flush! This is due to the oil getting thicker with age and bla bla bla... The job is almost $1000 and if this solves my tranny acting up for sure 100% -then I'll do it. Problem is he can not guarantee it will fix it..
I think this is is an electrical issue with the tranny. What to do?!