Lately, i've had an issue with cc. If i'm in cc mode and accelerate, even though the cc deactivates the retarder stays activated. Sometimes i drive in the highway with cc and if i accelerate the retarder stays on (Although the lever is on highest position) and if i let the gas pedal the truck ends up hard braking so 9/10 times i end up crashing especially if i'm turning. That doesn't happen if i brake during cc. Is there anyway to fix that issue?