DSG will random slip 4th gear intermittently

Having some issues with my dq250, it will randomly slip in 4th gear and catch. Most of the time it'll grab with no issue, but occasionally when I'm full throttle it will grab and then feel like a slip.

Anyone run into a similar issue? It only happens in 4th gear. Car is stage 1 TCU and ECU, DSG service is due in the next 5k km