FLAPHappy,
Well, I hate to tell you this but the guy at your LHS is giving you bad info. Yes, the Spektrum/JR receivers do have a problem with them rebooting while in use, but it has nothing to do with the actual hardware or programming in the receiver. The reboots happen when the voltage drops below the lower voltage requirements of the receiver. I can't remember the exact number but it's ~4.6-4.7 volts. What usually happens is that a user will fly until their batteries are getting towards that lower voltage threshold and that at some point in the flight the movement of the servos will draw enough juice to drop below that voltage level and the receiver will reboot. The simple solutions to this problem are to A) use a big enough battery pack to run your equipment. For my JR planes I am using 5-cell 2500 MaH packs to avoid this problem. B) Monitor your batteries and don't fly when they are getting low.

If you do send in the receiver they are reprogramming them so that they have a lower voltage requirement for a reboot. But you can safely use these receivers if you follow the guidelines I stated above.

Hope this helps

Ken