Recurring dpf issue
 

Hi I'm new on here and looking for some advice . But first a little background info. I bought a 59 reg diesel 2.2 (185) estate 6 weeks ago lovely car smooth and good to drive. However I seem to have fallen foul of the dog curse. In the past 5 weeks I've had the dpf forcibly regenned once a week ,taken off and cleaned out once and but back. And then brought an aftermarket filter,( yes stupid I know). All of this has been to no avail as the DPF light keeps coming on after approximately 150-200 miles( which can't be right).
I'm starting to think that :- a ,I'm an idiot . b, that the problem related to one or other of the four sensors. Has anyone got any ideas.