Edge S6 connectivity/sync issues

Hello,

I've been experiencing connectivity/sync issues for a while.

I can't make any voip call (Skype, Messenger and Whatsapp): the call drops immediately
GPS can't track properly, even if it says the signal is great
Voice messages on Whatsapp only arrive if I click on the conversation
Google Calendar not syncing properly with Desktop version
Can't listen music, song get stuck when ends, and I have to manually forward to the next track (Spotify and Blinkist)

Other info
Android...

Edge S6 connectivity/sync issues

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