FSFlighmax crashes after i turn on radar??

im using it with the piper cheyenne 400LS and i have it on standby first then after i take off i switch to radar on and it works good for about 2 min then the crash box comes up and says no go i can then choose to not send and it drops me to windows and i can still go back into fs and continue my and even turn on fsflightmax again and it works fine, i just dont turn on radar, anyone??win xp homefsuipc 2.98?? the latest as of todayciao!Brian S