Losing signal. Help?

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http://androidforums.com – Hello! I've been noticing lately on my phone that I randomly stop getting signal until I toggle airplane mode on. It seems to happen when I don't use my phone for a while or when I switch from WiFi to 3g. The phone shows it has signal, but it wont connect until I use the airplane mode. Anyone got any ideas why that's happening? I started noticing it while using Angry Bean, so I switched to WFTN to see if that would fix it but nothing. (General)