I would do a full backup, then do a hard reset (assuming the soft reset doesn't help.) Then run some tests. If it works, restore your backup. If it no longer works, you'll probably need to just rebuild from scratch. If it does work, then problem solved.
I'm not sure what you could do to screw up your radio, so if it is a radio issue, I think you might have some luck and doing the backup/hard reset/restore...
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