Went for a ride yesterday and once going for a while, I noticed that my diff lock was not working. Tried to adjust but nothing. Then later in the day, when I would put my machine into 4WD, you would hear a knocking sound when driving. Knocking would go away when put back in 2WD. Loaded up the quad and went home , Did not want to make things worse. Washed the machine when I got home(wasn't very dirty since we were driving in snow) Unloaded my machine, put it in 4wd and the knock was gone!!! Tried the diff lock and it would work as well but where it says lock on the pod would flash on and off. Any ideas?