Why did my Monero sync go back to 0?

full image - Repost: Why did my Monero sync go back to 0? (from Reddit.com, Why did my Monero sync go back to 0?)

This is so frustrating and im stuck at 0% now hasen't moved. Why did it go back to 0? from 99.6?

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Mining:
Bitcoin, Cryptotab browser - Pi Network cloud PHONE MINING
Fone, cloud PHONE MINING cod. dhvd1dkx - Mintme, PC PHONE MINING

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Exchanges:
Coinbase.com - Stex.com - Probit.com

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Donations:
Done crypto