well this is actually a pretty common problem on the older explorer but this is the first time i have ever heard of it on one that new. how many miles do you have? it usually starts happening after about 100,000 miles. sorry i dont feel like typing this all out right now but here's the link to the thread a while back explaining other peoples experiences with this problem:
Dead Link Removed
just look for selinoid, thats the easiest and cheapest thing to do. but of course yours is very differnt from are older explorers so it might not help at all.
