It won't sync because it wont stop pumping in new rewards from the network long enough to do any syncing. Then any new coins get rejected as orphans because I'm not synced.
Solution: Download the full blockchain or use the snapshot and make sure your chain is fully updated BEFORE you unlock your wallet for minting.
Also consolidate all of your coins into one transaction. I had so many mint coins minting at all time of day and night, until I sent all my coins to myself in one transaction. 20M. It's been a while and I'm going to do it again soon so my computer can get some rest..