I logged this same problem with Cambium the other day. Having the problem on all my 670's when I click different options on the 670 to quickly or spectrum analyzer. The GUI crashes but the link is still live till watchdog reboots it. A work around I did was to enable telnet to the radio and then do a manual reboot when it stops responding.
Support advised they are aware of the isse and that a fix will be coming out in the next update.
We are indeed working on finding a solution to these problems. I think the post here actually highlights two distinct problems.
Mr. Ozrelic is showing us an unwanted restart triggered by the watchdog circuit. Watchdog Failure 27 on PTP 670 is the same as Watchdog Failure 26 on PTP 650. There are already some discussions of this in other topics. See PTP650 Watchdog Failure 26 .
We believe that this problem occurs under certain conditions when the ODU is managed using cnMaestro, after the ODU has been running for about 49 days and 17 hours. That's the range of a 32-bit count of milliseconds. I realize it's a lame workaround, but you might prefer to restart the ODU at the least inconvenient time before the 49 days 17 hours point is reached.
Mr. du Toit highlights the other problem. Here the ODU is not responding to management, but it has not restarted, and continues to pass traffic. See PTP670 master side management dead until reboot