Hello, 

The last few weeks I have seen high CPU usage on our Vigor 3910, spiking to about 88% and mostly sitting around 40% during the work day.

It's causing concern as users are reporting issues with their phones and connectivity to the systems and our RDS particularly for remote workers seemingly when the CPU spikes.

I am running 4.4.5.1, but the issue was present on the previous FW version too.

We have a 1Gbps/1Gbps connection, running a few port redirection rules, QoS with VoIP prioritization enabled and there are two site-to-site VPNs.

Has anyone got any suggestions as far as the high CPU usage is concerned and any ideas where I should be looking first?

Thanks