Hello.
I do not know what can be the problem.
I have had the mikrotik cloud core ccr-1036 running the the last 3 years with no problems.
The router seems to be rebooting at random times maybe every 5 mins 2 mins or 2 hours.

Nothing has changed with the router config, summer has come but i do not see any over heating.
It does not give a auto support file when this happens. Just in the terminal a message saying shutdown maybe due to power outage.
I have noticed when it reboots it has changed fan from main to Aux.
System helth = volt 22.2v / temp 38c / cpu temp 54c / current 1099mA / Power 24.4W
System resources cpu count 16 / frequency 1200Mhz / cpu load 5%

I was on the lates version but changed to 6.40.8 bugfix and still the same problem.
Could this be a psu problem or something else.
I can provide any info needed, i am using this router to run my Wisp.
Thank you.

Could this be a psu problem ...

Yes, it could be: CCR1036 Power Supply

Take a peek inside and you'll know.

I have a new psu coming tomorrow.
Its strange i took the mikrotik top off and now have a fan blowing over the top.
I have not had a reboot yet. There is a buzzing noise fron the psu.
Does the mikrotik cutout if the psu overheats?
The cpu is not showing as overheating.
Its strange that it does not reboot with a fan blowing over the open mikrotik.

I have a new psu coming tomorrow.
Its strange i took the mikrotik top off and now have a fan blowing over the top.
I have not had a reboot yet. There is a buzzing noise fron the psu.
Does the mikrotik cutout if the psu overheats?
The cpu is not showing as overheating.
Its strange that it does not reboot with a fan blowing over the open mikrotik.

There was a batch of CCRs with... problematic psu. If I remember correctly, the capacitors didn't take well the heat, and failed much sooner than expected.

Might help someone else.
Replaced the psu and everything is working fine.
Regards