These guys will fix you up for a very reasonable cost:
The cost of the head unit was justification enough for me to buy the lifetime extended warranty. The're is no way those delicate 2.5" hard drives will make it to 10 years (probobly a lot less), especially in a Wrangler.
By the way, if you use car washes, they are likely cleaning the interior with an ammonia based cleaner like windex. Ammonia + sun exposure will "craze" plastic that way.