oh! I didn't even think of it being on the outside. I wouldn't imagine there being problems there.
Do you have a route or three that you normally drive? If so, have you had a chance to run some tests with the camera on it and compare the differences? Having 2 pictures per second is 6 times more than what I can do with my Garmin Virb Elite, just a picture every other second. If it's like some other things in computing, the CPU / computing power needed for that may be exponentially higher. If that's the case, I'd expect backing it off to a picture every other second should make a clear difference. If not, it's something else with the firmware.