I went out yesterday with some friends for a snow ride. I unloaded and played in the parking lot for a few minutes then we hit the trail. A little ways down the trail my 4x4 light started flashing 2 times every couple seconds, and it wouldn't go into 4wheel drive. Is this a code or something? This went on for about half an hour the we stopped to take some pics. I shut it off and about 5 or 6 minutes later I started back up. Funny thing is when I started it back up it went right in to 4x4 and the light never flashed again the rest of the day and worked just like nothing happened. Any thoughts? It's an '05 ForemanS 500.