I recently had my xts2500i vhf radio DSP upgraded, and now after transmitting for approx. 5-7 mins, the radio would automatically reset itself and go into Self Test mode. This happened a few times, and now when I turn the radio on, I get Fail Code 02/90 on the display. Before I take this to my Motorola dealer, what does this code mean (I've performed a search to no avail) and is their anything I can do to remedy the radio operable, or just let the techs play with it and pay the $$ to fix it?