100% CPU on RB230 and ROS 2.8.28

Hardware MikroTik hardware general
1

I have just noticed that one of my routers has bean pegged at 100% CPU utilisation since I upgraded it from ROS 2.8.26 to 2.8.28 two months ago. There is no excessive traffic or number of packets being passed through the router. There is some packet loss when I ping to devices beyond the router i.e. pinging through the router.

Any ideas what might be causing this?

Thanks.

2

Is this router running the Hotspot?

3

No, just simple queues, P2P traffic control, ARP-Reply only on one interface (two interfaces total), NAT, DNS cache, a few basic firewall rules, PtPP server (one connection) and a couple of static routes. I disconnected all customer traffic briefly and no change.