Im curious as to how common of a problem a random reboot is with this phone? Im on my 4th Opt S and 3 out of those 4 were replaced due to the phone randomly rebooting itself. After about 2 weeks with the most recent "S" it too will just out of nowhere turn itself off and require a battery pull to get it to turn back on. Ive replaced sd cards and batteries to no avail. My most recent bout with sprint cust service was incredibly frustrating as well. Im ready to find something else at this point. Thanks for any advice.