I had the pleasure of conquering some awesome trails today, but I feel like something is wrong with my 4wd. Here are two videos. In the mud video, the front wheels don't appear to be doing anything. It looks like 4wd is inoperative. In the second video, however, it looks like the front wheels are pulling and 4wd is working. Any ideas? Can 4wd work intermittently? I was in 4 low for both videos.