I upgraded it to the official 4.5.0.81 version the has been released. My phone kept rebooting ever 8 seconds. After 30 hours of troubleshooting I finally was able to downgrade it to 4.2.2.180. I had tried all the 4.5 OS, save .69 and .55, and they all had the exact same issue - my phone constantly rebooted. I recommend to NOT upgrade your phone to 4.5!
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