Gmail APP has sever Problem (notification and logout)

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2017-01-06 23:44

Version 5.1.12.0G on M3S .
I have the following problem  with Gmail App ..... no notification in standby even if i followed all the suggestion about power, application whitelist etc etc etc .
every day at the morning i found the GMAIL app that says it cannot access ..... no way to access ...need to reboot phone and then it access again.

I found out a strange behavior  the phone does have two entry in google cloud : one is M3S and the other MZ-M3S ...... can be this the problem? If yes i do not know how to solve it .

Please Help .