iPod classic restores and syncs but then iTunes freezes up
I just bought a used 80gb 6th generation iPod classic from this guy on eBay and it seems to be absolutely fine. But Im having these crazy problems trying to sync it. After it finally restored (that took a long time to work for some reason) and after it finally synced all my songs (that took like 4 tries because it kept freezing up on random songs and having an error or saying it needed to be restored when i already restored it), iTunes froze up AGAIN and it said like error or something and erased all the music from my iPod.... I am so frustrated. Currently I am syncing it again and I think it just froze up again. Also I tried unchecking the hardisk option on the summary page to see if that was the problem but it didn't seem to make a difference. HELP UGH
iPod classic, OS X Yosemite (10.10.4)