We've had a number of wallets get stuck and/or go out of sync with the rest of the chain and the more unsynced nodes there are, the more difficult it is to remain in sync. Please follow the directions in our resync guide to get back on track and stay on track: https://github.com/NulleXReb/Wallet-Resync-Guide
We are working on a new wallet update to address these issues in more depth as well but please resync your controller wallet and Nav wallets by following the guide in the meantime.
Thanks for the reply and a solution, I followed the guide to re-sync my wallet and VPS and now all is working well again. However I did noticed that earlier today I received a MN reward for 0.85 NLX, I'm just wondering what that is and should I be worried about it? I checked that my wallet and VPS are on the right blocks as the explorer and all looks the same. So not sure what this 0.85 reward is as I only got this after the update.