This is a suggestion for a basefile change for the Snom M9 to include a new settings parameter added with the latest firmware ver. 9.6.12. The idle_timeout_for_dect_reset parameter adds a watchdog check on the DECT wireless stack and resets it if it has hung and is not responding after xx seconds. This seems a good preventative measure.
firmware release notes: http://wiki.snom.com/Firmware/V9/Release_Notes/9.6.12
setting docs: http://wiki.snom.com/Settings/idle_timeout_for_dect_reset
Example setting in the phone-settings section for a check every 30 seconds:
Tim Miller Dyck