I have lots of

manager.ServerException: Slow sync record count mismatch: 2 != 9

in my GMS Email_Accelerator_User logs.

The devices (Sony P900) are doing sometimes a slow sync sometimes a fast
sync.
Is there ANY really useful documentation for troubleshooting purposes
available?

(I am not interested in the 'bla bla click continue to install the software
type stuff')

Georg