The climate control shuts off at 2500 RPM

Hello,
My air conditioning shuts off as soon as the engine speed exceeds 2500 RPM. It only starts cooling again when I turn off the engine and restart it.
What could that be?
Regards,
Martin.

Overpressure or underpressure in the system. Has anything been done to it? Error codes read --> Result?

Is the V-belt still in good condition and properly tensioned?

Otherwise, I would also have the pressure checked first and see what the error memory says.

Does it still cool properly, or has the cooling performance also decreased?

Is the fan still working properly?

Okay, so it's cooling normally like always, which means not very well, especially the ventilation. I already replaced the filter once, but I still think it makes more noise than air movement. Could it be that some of the vents aren't opening properly?
I had the coolant changed last year, and it was a bit cooler afterwards.
Is there a protective function that now shuts off the climate control above 2500 RPM because something is not working correctly?