Take it to a Dodge Dealer and have them check the PCM (Power Control Module). Mine started going out at 30,000 with the same symptoms. PCM's are covered under the 8yr/80,000 mile drivetrain warranty which is a good thing because the part runs about $700 but only takes 20-30 min to replace. Keep in mind, PCM's are very difficult to diagnose. The only way my mechanic could get it tested was to run it idle for 30 minutes and wiggle on the PCM for it to do the exact same thing with losing power and NO BUS in the odometer. Some might say something about voltage from the battery to the PCM which is erroneous because of the alternator passthrough, if voltage were an issue you'd be losing electric windows, radio and trip console electrical as well, which mine never did.
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