iOS locking into 2G

[dantecl]

Hey folks,

It seems that every time I'm streaming Spotify, if I happen to reach some area with lower signal strength, the phone (iPhone 4S) will lock into 2G mode, and of course streaming won't happen. I have to manually go in, activate airplane mode, then deactivate, and it'll get 3G signal again. Killing the Spotify app also fixes it. This always happens while I'm driving, so I have to switch back to AM/FM because I can't fiddle with my phone while driving. Is there a fix for this, or some sort of workaround?

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Dante