I bought a Garmin Colorado 400t to use on the sled this past summer, I have it all wired up to run off of the sled power and have it mounted on top of the steering post on my xfire 7. The problem is that the unit will run for about 15 mins then it will freeze making me remove the batteries to reset it. Is this caused by the cold? I have not had an issue using it in my car. With the unit freezing all of the times it makes it pretty pointless for me to bring it with me.