GC data missing occasionally

Happend two times already and always when my phone wasnt connected for a whie. I checked the sync history in the app and usually there are two entries for each and every synchronisation.

I have read this problem multiple times already here but no solution was stated, only resets that might fix it but not really.
I am no expert in IT but doesnt that seem like the import file for the missing time frame was about to be synced but then overwritten with a new now empty file?

First is always
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_VISIBLE_IF_FILES
###################################################################################

Second is always
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL(No items to process)
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_INVISIBLE
###################################################################################

But for the missing data Sync I have for entries

1st 
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_VISIBLE_IF_FILES
###################################################################################

2nd
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_VISIBLE_IF_FILES
###################################################################################

3rd
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_MANUAL
###################################################################################

4th
###################################SYNC RESULTS###################################
Upload status SUCCESSFUL(No items to process)
Download Status SUCCESSFUL(No items to process)
Time Sync SUCCESSFUL
Overall Sync Status SUCCESSFUL
Origin =5037_SYNC_REQUEST_MESSAGE_INVISIBLE
###################################################################################

I have an Instict 2 if that matters and it works perfectly fine otherwise, enough free storage no battery safer