Random Reboots with Straight Talk

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http://forum.xda-developers.com – Hi, I recently switched from AT&T to Straight Talk. Whenever I have the AT&T SIM card inserted the phone runs fine, but as soon I put in the Straight Talk SIM card, the phone reboots randomly. This happens 4-5 times a day. APN is set to StraightTalk ATT (att.mvno). Are there any other settings I need to change? Any input is appreciated! (HowTos)