Those coins are your staking rewards for each block you found.
the purse was synchronized for a long time, but after synchronization I began to receive 11 coins in 1-2 minutes, my purse had 1400 coins, now I received 24000 coins for one day.
I am not sure about this, but we need to wait for next version of walllet from devs. My wallet staked good two days ago, but around 26-30 hours ago (I don't remember exactly, it got stucked, could not sync regardless of whatever I tried to do to fix).
I tried to send 100 coins to another purse, and I sent them, there is a message about it, but the coins never came within 24 hours.
what is the problem.
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To sum up, I think all of us should keep calm, stop asking the same question over and over again, and stay tuned for more good news about verions 3.6.0 of Vsync wallet from its team.
Best wishes for Vsync project.