Zeit Syncing Tips for PoS
Keep your Wallet Locked when you are not Synced with the network if you have coins in your wallet.
The Blue Check mark will appear a few minutes before synced , but may not be completely synced yet,
Move the mouse over the Blue Check mark , and it will show
Last Received Block was Generated (Time) ago.When it says 1 minute or less , then it is a good time to unlock the wallet and let it stake.
If it says 5 minutes and you check it again a few minutes later and says 15 minutes, then close and restart your wallet, and it will sync quickly.
If you don't keep the wallet locked until synced, it will still try to generate stake , but since you are not fully synced , they will all be orphans. Or in some cases can actually try to fork, when this happens your wallet will freeze up at the block number where it tried to fork and not receive any more blocks, until you restart your wallet so it can get back on the correct chain.
Anyone unclear or need more details post.

FYI:
If your ISP has issues, it can cause you to fall out of sync with the current block # and a restart of the wallet may be required.