MTV-branded ZTE F870E passes the FCC hurdle on its way to Vodafone?

This new ZTE F870E has not been a good buy.
We purchased this phone the week after it came out for sale through our wireless company. After the first week during useage the phone will randomly restart itself. It continued a few times a day for several days, so we returned it to our phone co. they inturn gave us a new one. After just days of useage, it also began randomly restarting itself. So we again went back to our phone co. and we are unsure at this point what we are going to do. The terrible thing is we signed a 2 year equipment agreement to get a discount on the purchase price and I am afraid it is not going to last 2 years.