Samsung Edge S6 - Connectivity/Sync issues

[AC Question]

Hello,

I’ve been experiencing connectivity 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

Other info
Android version is 6.0.1
Tested in several different networks, issues persists

This is what I tried so far:
Clean cache
Hard reset

Hope you guys can help me!

 

[Rukbat]

6.0.1 has a number of known issues (which issues depend on which carrier), but the GPS issue has nothing to do with the others (and, with 24 satellites, say9ing "the" signal is great is meaningless - which satellite's signal? If you want an overall signal measure, that would be the DOP numbers you'd see in GPS Status & Toolbox, and that probably won't connect because the GPS receiver itself isn't working.