Doing objects and testing different parameters of slicing and different parameters of speed from the panel setting of Rep. Host. Still not very clear.
Often pieces are not well stuck to the plate and sometime they move 
Did you use sandpaper on the heated bed? This helps and make sure you are very low on the first layer.
I use paper tape now on my k8200 and everything sticks good to it.
No i never passed any sandpaper on the surface. …
So i should scratch the surface of the plate? Which number do you suggest? Low number and so rough or fine one over 300?
I did it with some steel wool but I think a high number would be the best as most people use a ikea mirror on their base plate.
The mirror is mostly to have a flat building platform so if you see that it is not very flat now you could also try that.
@Kristof_de_weyer
thanks for the advise I will try it
Your advice Kristof has been crucial and super useful!!!
It seems that I’ve sorted out any problem of detachment using sand paper on the plate (800 and 1200 size)
Thanks a Lot 
Nice to be able to help