Over the last few days my car has decided to run at a lower boost level and there is a big drop in power.

The boost gauge used to show 18-19psi under full throttle, but now it can only make a peak of 14psi.

Also at WOT the gauge needle fluctuates back and forth.

So would this be boost leak or something electronic?

I've already checked the DV which seems to be fine.

The car drives perfectly but just with less power.

Its an AGU engine BTW, with a k03s and a jabba remap.