CPU overload at 40%

Hi guys.
I have a problem with my mod duo. Click noise each time that change to red al 40%. I’m using just 3 plugins.
It just happens today using the input 2 with my acoustic guitar.
I have the electric on input one muted. Tomorrow just with the electric pedalboard even at 95% no has overload at all.
I take a video but I cant upload videos.
Can you help me?