I have been setting up Zabbix monitoring for some of our Mikrotik routers and during the course of monitoring a few devices showed chassis temperatures over 50 degrees Celsius. I decided to use Winbox to log into the devices that were flagging high temps and saw that the temperature on the units in question wildly fluctuating where it would change from 34C up to 56C and various ranges in between. Not seeing these spikes on the CPU temperature just on the chassis and I am wondering if there is some kind of bug causing this.

Which router models are we talking about, specifically? There are no reported improvements to health monitoring on the 6.x line in the .9 and .10 releases you have yet to install, but there have been some in the 7.x line that would not necessarily have been backported.

Are you concerned with the variability or the magnitude? 56°C isn't "high" in a production environment. Even crappy consumer-grade stuff will often survive long-term while running with 80° internal temps.

These are CCR1036-12S units, it is a bit frustrating as I logged into Winbox to see what was going on with the system and the temperature would go from 50 degrees C to 32 degrees C like it was in a school zone and suddenly seeing a state trooper. There is no way the temperature would fluctuate that wildly when there is barely a load on the routers and they are in a room that is reasonably air conditioned.

...and the temperature would go from 50 degrees C to 32 degrees C like it was in a school zone and suddenly seeing a state trooper.

[off topic] Brilliant !! [/off topic]

[still off topic]
It made me think of the classic xkcd: https://xkcd.com/612/
[/still off topic]

the temperature on the units in question wildly fluctuating where it would change from 34C up to 56C and various ranges in between.

I've got one of those that does the exact same thing.

Known issue on CCR1036-12G-4S. Dead capacitors on the board cause inconsistent temperature readings. More info here: viewtopic.php?t=162864

Known issue on CCR1036-12G-4S. Dead capacitors on the board cause inconsistent temperature readings. More info here: viewtopic.php?t=162864

Thank you, going to have to circle back with the team and let them know about this.