A recent beta firmware for the snom m3 cordless system introduced a most annoying bug. The handset could be turned off with a simple press of the end call button if the phone was not actually on a call. This made it way too easy to accidentally turn the handset off.
Happily, since I have my phone set to automatically load firmware updates it recently loaded v1.20 beta, and that problem has been resolved. The handset now required an extended press of the end call button to turn it off, just like any cell phone.
Snom tells me that a major firmware release for the m3 is forthcomming.