Is this a hardware or software issue?! recently i will be listening to music, making a phone call, or texting and when i go to press the lock button everything seems fine, but then i go back to get into my phone and it is off! The only way to turn it back on is with a hard reset. It takes about 10 seconds for the logo to appear and then it boots up and goes from "no service" to "searching..." then to "searching... 3G" then back to normal. I have never dropped it i have taken very good care of it, it is starting to get annoying having to reboot it constantly during the day. I just recently got my other one replaced so i got this refurb, could it be a bad battery? Thanks!