Geeetech A10 blocking in teflon tube

[BetronParks]

Hi all,

Lately my Geeetech A10 is non stop blocking, but the blockages are occurring in the heat break where the nozzle and teflon tube meet.

I have swapped to different filaments, different nozzles, different teflon tube, different extruder motor and different extruder mounts.

The issue occurs if im using simplify3D or cura.

Temp graphs for the hot end shows its stable +/- 1°C, there abouts.

Is there anything else im missing?
https://9apps.ooo/

Thanks!