A different error every time I sync my iPod Touch 64GB

Question

I have an iPod Touch 64GB. After iOS4 upgrade and iTunes update, at least half of the times I connect it to my pc (Windows 7 64bit) some error comes up like, the ipod is disconnected (when it's not), a duplicate file has been created, the requested file cannot be found, error -48, error -64... you name it.
When this happens, I get a screen asking if I want to set it up as a new iPod, or if I want to restore from backup. If I select restore from backup, it tries to, takes an hour and then some error pops up, forcing me to set it up as a new iPod, which takes another hour.
A few days ago I decided I'd had it and restored it completely to factory settings, losing all my information (remember it never can restore from backup?) in the hopes that it would make it function normally again. Until last night... when I tried syncing again and again the errors, and having to set it up as a new iPod.
I've read many posts here, about deleting iPod Photo Cache and other solutions, none of them work. My iPod is NOT jailbroken, nor do I use any iToner or any other plug-in or weird non-Apple application to tweak it somehow...
Any answers?
Any suggestions?
How do I avoid having to set up my iPod as new every time I plug it to my pc?

Answer 1

Ok, so I tried syncing again, again the myriad of errors, one pop up after the next, you know the drill. At last, I set up the iPod as new iPod and when I did that it leaves it as having to sync all podcasts, iTunesU, photos, contacts, calendar, as new. But before I did that, a new pop up, an update for the iPod software version 4.0.2 (8A400). I updated the iPod and then checked all the boxes to sync all my content... so far, it's working. I'm hopeful that this update will fix the problems. If not, then I think I'll have to take it back to claim the warranty. Cause I don't see what else to do. I'll be back here with news.