I think this problem is some type of locking that Sync on the QNAP NAS is doing. Basically got no where with it. Finally went and set up syncthing from Github on my machines and it seems to work fine. Had used Syncthing years ago for backing up some critical stuff and it worked very well. Thanks for all the comments but I think this is some type of lock that Sync is doing, particularly since I can't use the latest software on the QNAP so lan syncing is not available and it is going up and back from the internet.
Syncthing on 3 machines is working fine now two more older machines to put it on and hopelully they will all work the same.