UPDATE on my issues:
I have had the problem quite a while and from reading this forum was 99% sure it was the DMF but still drove 10,000km before I did anything about it. During this 10,000km of misery the EGR valve went and I had to add coolant Every 250km.
I finally bit the bullet and left the van in for repair while I was off on two weeks vacation recently. The DMF, Clutch and EGR valve was changed, gearbox service and the under plate stainless steel guards I had fitted by VW had the dents hammered out. It cost me 4000 euros all in which is fine as the van is owned with no debt and owes me nothing at 130Tkm driving. The only issue I have now is the annoying start/stop system no longer works but that may be because my battery like the van is from 2017 and low after two weeks of not driving, the leisure batteries are at 40% so a run of 300km to Frankfurt next month should sort that.
I have had the problem quite a while and from reading this forum was 99% sure it was the DMF but still drove 10,000km before I did anything about it. During this 10,000km of misery the EGR valve went and I had to add coolant Every 250km.
I finally bit the bullet and left the van in for repair while I was off on two weeks vacation recently. The DMF, Clutch and EGR valve was changed, gearbox service and the under plate stainless steel guards I had fitted by VW had the dents hammered out. It cost me 4000 euros all in which is fine as the van is owned with no debt and owes me nothing at 130Tkm driving. The only issue I have now is the annoying start/stop system no longer works but that may be because my battery like the van is from 2017 and low after two weeks of not driving, the leisure batteries are at 40% so a run of 300km to Frankfurt next month should sort that.