hmm..it could be a tower change. i know that when I am at home, and I end a call, it goes from 1X to EV, and i get 0 bars for about 5 seconds, and then my EV signal comes back (usually 0-3 bars). i have much better 1X signal than EV, but since i have it in hybrid mode, it flips towers after calls. maybe that could be it.
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