Sync stops after a while

I have the lite version of the module on a website. It is successful in connection and retrieves jobs from Bullhorn but after a while the automatic sync will fail. Looking in the logs it appears that the sync is run every 10 minutes, on my system at least, I can see if successfully connecting and syncing jobs or saying that there are no jobs to sync and then it stop and says that the OAuth access token is expired or invalid, at this point we have to manually re-do the connection and then it stays up for maybe a day, sometimes less, and drop the connection again with the same error. Very annoying, has anyone had this same issue and managed to resolve it?