I can confirm this. After a plethora of print problems I checked my Pt-100 and found the resistance values to swing wildly from 109 Ohm till 166 Ohm. Hanging in still air, outside the the thermoblock, so room temperature......
That equates room temperature up to 188 deg C while doing exactly nothing!
I've replaced the Pt-100 today and everything works liek a charm again.
Am a bit p****** o** at ultimaker for using inferior Pt-100 though. Cable was too long and wrapped around the PCB. Very good installation practice.... NOT!
Anyway, if you have issues w material flow, delamination and under- or over-extrusion check your Pt-100!