[Q] 3G not reengaging after WiFi use

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http://forum.xda-developers.com – I've been having a problem recently (past couple of weeks) that when I have WiFi on for any length of time and either leave it's range or deactivate it, my 3G will not reengage until I reboot my phone. I use Sprint and am in Oklahoma. I've also noticed over the past few months that my phone constantly drops calls, sometimes as many as 6 times in a conversation. The 3G issue just started about two weeks ago. I'm guessing it's just time for a new phone, but I haven't even had this one two years. Evo 4G model PC36100 Android 2.3.5 PRI 2.33_003 PRL 60690 (HowTos)