I have 6 TZ-180's that are still being used and they all started exhibiting strange behavior since last Thursday/Friday.
The CPU gets pegged at 100% and stays like that until it is power cycled. They then will work fine for an undermined amount of time (a day in some cases, sometimes less) until they need to be power cycled again.
It is strange but out of our 15 Sonicwalls, it is only happening to the TZ-180's. I know they are old and we are replacing them this week, but for it to happen to all of them is baffling.
I was able to get to the connections monitor on one of them while it was at 100% and the process that is causing it seems to be called: tWebMainS which I believe is the https daemon.
Even though I won't need them by the end of the week, if somebody knows how to remedy this so we don't have to keep power cycling them, it would be a huge help.