Question about WMF Lono raclette for 8

I have the same problem with the thermostat.

I had to submit the grill once under warranty because the thermostat always switched off too early and the grill could not hold the full heat permanently. The grill was replaced by Galaxus without any problems. The new grill has now worked for 3 years without any problems. Now I have the feeling that the function of the thermostat is no longer 100%. Otherwise, we are very happy with it.

Even with our appliance, the thermostat keeps switching on and off. We put our old appliance back in, but with the new, better pots.