Metarouter + Openwrt = freezes?

Hello, i recently compiled openwrt image for my RB493G (nothing special, just mail server and radius server)

The problem is i have randomly freezes of virtual machine. It just becomes completely stalled - no reply at icmp, no logs, no kernel panics - only reboot can help
(thanks to netwatch feature - i can “solve” that problem by rebooting when ip becomes unavailable :smiley:)

Today i discovered strange thing - if i left some background command (for example i use “while true;do dmesg -c;done”) virtual machine works as it should!

According to replies from ##mikrotik, this problem is not related to my hardware - some ppl have this issue too.

So, any clues how to fix that?

And sorry for my bad english -_-

Small update: it works with that script, but cpu load always near 100%.

Also, sometimes when disabling-enabling that virtual machine, router reboots.