I have my CR6-SE for 3 days now.
I was able to print few objects with correct quality, except for a little bit of stringing.
At one point I tried to add the G29 instruction in my start GCODE in Cura, so my printer should perform the bed levelling before each print.

It was a really bad idea.

The nozzle has directly sunk into the bed, and has etched a straight line groove in the coating. I have obviously turned down the power at this point, remove the G29 instruction, performed another bed leveling from the touch screen.

Since that momen, all my prints have failed.

No filament at all has come from the nozzle when I tried to print temperatures tower or retractation towers.
With other objects, the filament is extruded, but there was no adhesion on the bed.

I've tried to change the nozzle in case it gets damaged.
During this operation, I noticed that le little LED light of the leveling sensor was remaining blue all the time.
So I have thinked that the support of the nozzle could have been bend, I have tried to force it in the opposite direction until the light turn off.
Now, the light turn on only when I touch the Nozzle.

I can print now, but it's not as good as before.
I have adhesion problems most of the times.
In the worst case, the filament don't even touch the bed,
In the better case, there is warping.

There is solutions, or I have to accept that I just have an expensive bad quality printer from now ?