RB4011 sometimes maxes 1 core

I have RB4011 and it does not always spread the load on other cores, doing a speed test it sometimes uses multiple cores but it sometimes gets stuck on 1 core using 100 percent. Is this some kind of problem with the router? ISP is DHCP (IPOE)
Thanks
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Use tool profile to see what processes are taking up the maxed out CPU.

You always did the speed test using multiple connections? RoS doesn’t distribute the load of a single connection.

It says firewall and ethernet, but this does not always pin 1 core it does it randomly, it like it sometimes gets stuck on 1 core, re do speed test and it distributes among the others

Yes I use multi