Mogul Won't Charge while using internet

[Silent Assasin]

I did a search and have not found a positng for this. I just noticed that if I have my mogul charging on the car charger while streaming or surfing the internet, the phone does not charge. I received the dreaded Flight mode and the phone would turn off. I checked to make sure it was recognizing the car charger, but when I connected to the dataplan, the phone would stop charging. My Apache allowed me to stream and charge the phone at the same. Is this a glitch. I use the phoen for long road trips and I need to be able to use the car charger to keep battery charged. Any suggestions?