I have a 1hr commute each way so I'm constantly changing the modes on my non-NAV radio... all combinations of FM1 to AM to CD to AUX, and by next week I'll have XM too... and I have never had this problem. I use both the headunit buttons as well as the MODE button on the steering wheel. I would have your service dept take a look at it, that way at least your complaint is registered in the system well before the warranty expires.

fyi - my car was a july06 build. Maybe there was a bad batch of headunits used in the earlier builds?

CAMRHEE Hybrid - FOR SALE!!!!
Completed Mods: RK-Sport body kit, 18" LexusGS430 wheels 235/50ZR18 tires, TRD/SE springs, Rear Lip Spoiler, Terk XM-Direct, Smoked tail lights, Sliding Armrest, Rear Bumper Applique, Front License Bracket, Lower Grill chrome inserts, K&N, Blaupunkt THB200A sub, moved rear HSD emblem
Future Mods: fog lights, black chrome my wheels

http://www.greenhybrid.com/share/fil...fterFront4.JPG