Had the same thing only a few days ago.
The strange thing is. Had it on for maybe 5k miles now all fine, I do short journeys less then 5 miles to work, or to the shops. Very limited motorway driving, and a very heavy right foot. All has been great. But when I done a 100mile round trip, cruise control on 70mph on the dot. Normally motorway I get bored at one speed so speed is varied(of course within legal limits ) It tried to regen, then DPF light, then coil light (limp mode_ then engine management light lol. All 3. Got a regen done, was cleared in 4 miles driving when clearing the errors.
Just strange how my car doesn't seem to like long steady journeys, it seems to like varied driving, this in turn stopping it from regen.
Personally if I got another 5k miles before it happened, im still more than happy with the DPF delete
Chris