Unexpected enclosure status detected

I have been getting these messages (below) over the past two days. Between 3-5am. The NAS is inside my stored RV with no heat and it has been colder than normal 18-20F lowest temps. But I am getting over heat alarms. And shuts down. When I reboot everything is normal. I feel these are false alarms and may be related to the cold temps. I have had this ready NAS operating in the same location for about 3 years without issue. All 4 the same WD 2GB drives - Ready NAS NV+ V1

To me its obviously not getting to 500F when its 20 degrees outside.

Emails that pretty much match the logs.

3:29am
Disk on channel 1 reports a temperature of 255C / 491F.
Disk on channel 2 reports a temperature of 255C / 491F.
Disk on channel 4 reports a temperature of 255C / 491F.

Please shutdown the system immediately for service.


3:28am
The reported temperature of a disk in the ReadyNAS has exceeded maximum recommended temperature. Shutting down the system to prevent hardware damage.

Disk on channel 1 reports a temperature of 255C / 491F.
Disk on channel 2 reports a temperature of 255C / 491F.
Disk on channel 4 reports a temperature of 255C / 491F.

Fan 1: 2272 RPM