This has happened to me a few times when wheeling and once when launching my boat. The brake pedal goes stiff and disconnecting the battery reset things. This also wipes out any codes so the last time it happened I used my Superchips Flashcal to clear the codes which it did so fast I didn't get the code nos. but there was reference to left and right headlight issues. I run JW Speaker led's without problem generally and whatever the problem is I have so far been unable to replicate it as it is so intermittent. Next time I will get the code no's before the Flashcal wipes them out but I am curious if anyone has had the same experience with a gremlin like this! I have taken it to the dealership and they were stumped also.