Can't establish a reliable connection...

Hi guys I'm new here so please bear with me.

Reading some of the posts regarding this issue and I can't seem to find an answer.

Connection is good, via WiFi.
Already factory reset my phone.
Tried rooting and unrooting my phone.
Edited hosts, still nothing.
Even tried installing custom ROM, which I am unsuccessful.

I need help.
Whatever I do, can't seem to sync any gmail account on my phone.
It was working perfectly before, the all of a sudden, boom.

Thanks in advance.

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