DPF burn off to regular

[Andrew Games]

Hi,

so I have a insignia 2.0 cdti eco flex 2013 I've recently had the dpf filter cleaned and changed the pressure sensor, had it checked for leaks on all the pipes which are all ok, for some reason every other day it starts do do a burn off and smokes, this continues until it says "dpf fitter is full continue driving" then it goes into limp mode! 

Any ideas at all appreciated