I had bought the 30g zune back in late June. Finally, just this month, (late Oct), my zune would freeze. it wouldnt shut down mind u, and, having just updated the software, and with it fully charged, it was freezing as soon as one song ended or when i tried playing another mp3. After a few seconds, the screen would dim. I could see that its still frozen on the last album i was listening too but it wouldnt respond at all no matter what i did. I tried holding down the power button to reboot and nothing. I would go back home (being half way to the gym, really annoying, that part) and plug it back in and nothing. all the while again i can still see thru the dimmed screen the last song i was playing before the freeze. after enough time, the battery would finally die and i would be able to plug it back in. It would recharge and work for a short while (couple hours at best) before doing it all over again.
So finally, i took it back to best buy and had geek squad have a look at it. Given it was well past my 30 day return policy, the only way they would be able to replace it for me would be if geek squad and/or the manufacturer (i.e. Microsoft) deemed it was not repairable or worth making the effort to try a repair. The techie gave it a good once over and decided then and there that i would need a new unit.
Two problems. First, they discontinued the 30g. but that actually granted me an automatic upgrade to the 120g. But the second problem was that they only had 2 previously opened boxes for the 120g. Being assured they were just fine, i grabbed the newer looking of the two. Later that day, it exhibited the same exact problem as the other one.
Thus, they have now ordered me a brand new 120g unit which i can expect in lil over one week. So lets see how this goes. I'm getting a brand new 120g, having paid for a 30g, courtesy of best buy, not microsoft. But what good will 120g do me if it doesnt work yet again?
Anyone experience anything similar to this or have any suggestions on what this might be tied to?

There! thats what happened to mine right before it decided to start auto rebooting itself. i cant even get it to stay on long enough to get past the firmware update.
I broke down in tears when it wouldnt update.
I really love zunes but this is seriously getting out of hands.
If your new one doesnt work are you getting an iPod? (Im thinking about it)