Okey, my K04 setup have been running great for about 1 year now but this week I noticed that the boost first hits 1.5bar as it should but then creeps down.
And this morning it hit 1.5bars as usual but bam it fell down to under 1 bar... I let of the gas and floored it again this time it held 1.4-1.5bar as it should.

I changed the N75 a couple of months ago so that should be fine.
I'm thinking O2-sensor or injectors/plugs...

Is there something I could log with Vag-Com?

The car is a European 1996 1.8TQ AEB.