I also noticed temperature drops of the right extruder. Only 10 degree drops but still. Screenshot of the temperature graph running firmware 4.0.
To me it looks like the power management is somewhat off. The IMHO undersized power supply probably doesn't help.
I remember reading that Ultimaker changed a few power setting with 4.0. Maybe @maht or another UM employe can help us to fix the problem?
Something may be wrong with your cable since it is happening with more than one core and material.
I would definitely check with your reseller or support people and see if you can get a new cable.
That should not be happening.
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