And Mullick I also get checkpoint too old error and wallet out of sync now...
If you didn't encrypt the wallet it should allow POS minting now. It's entirely a personal decision on keeping the wallet open or just opening every 15 days. I keep mine open and produce multiple POS blocks everyday. POS ensures the network continues in the future; but, I think it also helps support the network now.
Everyone gets the checkpoint error when a new checkpoint is due. I'm sure Mullick will have a new checkpoint release soon. It is of no significant concern and maybe less so now that the forking issues have been eliminated.