After updating to the ember firmware and changing to Z2M, the dongle seems to fail or something. It works fine at first but after some time, could be few minutes to few days, it crashes and cannot be restarted in any way possible, even with taking the dongle out.
This probably isn’t of any help, but I’m staying well clear of EFR32-based Zigbee controllers, I’ve seen too many fail or become unstable after a while.