I had the same exact issue with my car a few weeks back... Had it towedx to the dealer and they claimed "no codes present" or any CEL on the car. Yeah, they just disc the battery seeing as all my presets were gone. Seems to run alright now though
since you had the same problem and your not running an open dp, and someother guy on here was running an open dp and did not have this issue.... maybe the open dp was never the problem? yet everyone blamed rodney., see what happens when people jump to conclusions