So my first Nexus had stuck/dead pixels, so I went in today and got another one. The box looked pretty beat up but i didn't think much of it. Within ten minutes of use, the whole screen "glitched?", almost like when you get no signal on a tv, but with colour. 2-3 seconds later, it rebooted. Within 1 hour, it rebooted 2 more times. Its been 3 hours since and it hasn't rebooted. I called up Samsung, they told me to do a hard/soft reset. I told them I'd already done that, they then told me to do a factory reset, and I informed them that i've done that between each reboot. They told me to go and exchange me Nexus once more...but I have a feeling those kiosk guys are gunna be resistant to exchange it for the third time as the phone probably won't reboot while i'm there. What should I do?