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Have you had the car long? Any documented detailed history of service? Did you use Mopar ATF+4 fluid - the specific type for the transmission on these? If not, that could be part of the problem. Or naff all to do with it. These are very sensitive little souls, on all manner of things....

According to the manual !! TRANSMISSION TEMPERATURE SENSOR The TRS has an integrated thermistor that the PCM/TCM uses to monitor the transmission’s sump temperature. Since fluid temperature can affect transmission shift quality and convertor lock up, the PCM/TCM requires this information to determine which shift schedule to operate in. The PCM also monitors this temperature data so it can energize the vehicle cooling fan(s) when a transmission “overheat” condition exists. If the thermistor circuit fails, the PCM/TCM will revert to calculated oil temperature usage. CALCULATED TEMPERATURE A failure in the temperature sensor or circuit will result in calculated temperature being substituted for actual temperature. Calculated temperature is a predicted fluid temperature which is calculated from a combination of inputs: ² Battery (ambient) temperature ² Engine coolant temperature ² In-gear run time since start-up so check if fans are cutting in ?? Oil gets less viscous as it warms up .. I imagine this would cause slip rather than not changing up but I may be (and probably are) wrong. If `the temp is out of range I would imagine you would get a OBD error code,although there is no mention of this in the 41TE section of the worksh*t manual .. check for error with key dance. Also can find no mention of acceptable temp range - sorry. Also, good to identify your vehicle as you may not have a 41TE box........