I have a very bizarre problem lately:

 

contacts are disappearing from my phone. They are still in the mail.google accounts, in Outlook on my win10 comp and in Thunderbird on my Linux Comp. But disappeared on my phone.

 

At the same time, some contacts just not duplicate, but I have them like 30 times in my phone directory, making the phone functions extremely slow.

 

I used GoSync to sync between Outlook and Google, just changed to ContactSync as I suspected it as the culprit. No betterment yet. 

Thunderbird syncs with an add on and the sync function of my phone is on and active. 

 

I used an app called Duplicate Finder to crop the duplicates, but they pop up faster than you can delete them.

 

Any advice?

I use Gmail so no need for any other Sync tool. Been flawless. Even did a Factory reset - they all came back, Galaxy S5

Yes, that's what I do... Did a factory reset this morning, looks like it's back to normal.

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