Snom 360 reboots automatically?

I have a client that’s running on Asterisk and they have 1 Snom 360 and 8 LinkSys 941 IP phones on the system. They had experianced alot of echo on the Snom 360 so I upgraded them last week to the latest firmware and software for the Snom 360. They called to day to say in the last two days while in conversation of the Snom 360 disconnects from the caller and reboots. Is any else having this same issue? How do if fix?