We have RB800 on main route with seven mini-PCIs ROS v5.8.

There is problem with random rebooting, its caused by "kernel failure" in log.
It is doing in all 5.x versions. RB is in insulated closed case where cannot be temperature below zero.
It cannot be voltage problem (its stabile)

Tried Netinstall through COM, set lower cpu-frequency..
and no result, it is doing still.

Can anybody help? please.

We have RB800 on main route with seven mini-PCIs ROS v5.8.

There is problem with random rebooting, its caused by "kernel failure" in log.
It is doing in all 5.x versions. RB is in insulated closed case where cannot be temperature below zero.
It cannot be voltage problem (its stabile)

Tried Netinstall through COM, set lower cpu-frequency..
and no result, it is doing still.

Can anybody help? please.

This is a question best sent to support@mikrotik.com

does the router still reboot when there is no configuration on the router? When you add configuration gradually, check when router starts to reboot.

i have a similar problem with rb1200 - rebooting with 5.8 and imported config and can´'t find reason
but cant add config step by step becaus it is production at a railway company - working 24-7
supout to support allready sent...