"sync is currently experiencing problems, it will be back shortly"

Lately my contacts dissappear couple of times a day. The only way to get them back is to reboot the device. I have a Samsung 5S mini (SM-G800F). I was looking in the acounts settings, and I usually see the message in the topic in the bottom, and have a failure sign next to the contacts sync. I've looked this problem up online for a long time, and have tried lots of stuff. I've cleared cache and data for practically alsmot everything related to google services and contacts. I've also tried the Contacts Sync Fix app, and resetting preferences for all applicatios. Nothing seems to work.
I figured out I lately also have this 2 messages appearing from time to time (have followed instructions to get rid of them, but didn't work either):
"Unfortunately, the process android.process.acore has stopped"
"Unfortunately, the process com.google.process.gapps has stopped"

Is there anyone with a good solution to this? It drives me crazy

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