Time difference on displays

[FSGOM]

Two displays SV1000 , latest SW

After booting the right one doesnt start up , after manual booting , I detected a time difference during the whole flight of about 32 seconds, right was later than the left one.
The GPS fix UTC info on both were different as well.

What could cause this?

 

[Raymo]

Check the GPS assignment and com port data counters on both.

 

[Dynon]

Couple of question: Do you boot them at the same time? Do you have backup batteries on both?

 

[FSGOM]

both have battery backup , right display was booted later manual.... because sometimes with the master switch only the left screen starts.