This is a very good thread. It nice to see that an insufficient battery can be the root of these problems that many would say was the fault of the "Spectrum System". I have read numerous threads of problems that are Spectrum related, and thats where the blame is placed.
I on the other hand know from experience that, one crash I had was caused by a bad battery causing my rx to reboot(before the quicker reboot rx's), too low to the ground and smacking my heli hard. All my other crashes could be traced to pilot error and or battery issues.