We are suffering for similar problem, and it started 2 days ago.
Our router is working for more than a year without ANY hardware changes (P4@2.6GHz). Our maximum CPU usage was upto 35-40%, average less than 20%.
2 Days ago, CPU usage raised to average +80% without any reason. No configuration and/or hardware changes are made.
The CPU graph looks like this:
For a couple of hours, CPU load went back to normal (as seen on the graph) and I hoped that everything is OK. Unfortunately, it raised again with no explanation what happened.
Mtik version 2.9.8.
ideas what can be the reason for this behavior?
I sent the supout.rif to email@example.com
Hopefully, there will be some answer for this from Mtik stuff.