RayLandy45

Can anyone help me? My 2002 freelander TD4 recently had a strange glitch. We were driving through a tunnel with the radio on, when the radio cut out, made a beep and "alarm" came up on the radio's screen. Then, a voice said "thank you for your patience, please restart your engine and proceed cautiously" and repeated this until we turned off the radio. CAN anyone tell me what is wrong?