PETG melting between LGX and Mosquito Magnum

Hello, I aluse the provided 24V Hotend fan. Wiring and jumper setting to 24V. Smaller prints are okay but larger ones always fail BECAUSE the PETG filament melts inside the ptfe tube between Bondtech lgx and the mosquito Magnum.

I checked everything but without finding a possible mistake.

Anyone knows this or a possible cause?

BJ