Is your file free memory above 12000000. Is your battery fully charged. Sometimes low memory or little battery charge can have issues to wear it shuts off radio to conserve memory or power
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I was having problems with the trackball with my Pearl so I took it to Verizon and they replaced it for free. As soon as I got home I noticed that the radio on the new pearl was off, so I went to the connections manager and manually turned it on. After 30 seconds or so, the radio turned off. The battery was full so I don't think it was an energy conservation issue. After trying in vain several times to turn the radio on and keep it on, I took it back to Verizon and they replaced it, for free, again. I am happy to report that so far there are no problems with my new Pearl. Two days and three different Pearls.