Big problem with automatic gear box ?. Lack of power.

[piapia]

Hi.
At the beginning of the topic, I wont to sorry for my English ;-)
Auto: W203 C30 AMG (3l diesel), automatic transmission 5 gear. Mileage 100k km.

I try to explain the problem:
- Every times it happen in the same circumstances. When I close to crossroad, braking and stop. When I can drive it doesn’t have a power. It starts but very slowly, sluggishly and I can’t exceed 3000 rotation/min. I tried to change gear manually, change C/S button, drive reverse gear and didn’t change. But after few sec/min when I pushed acc pedal power is back in 100%. When I turn off engine, and on again nothing change and sometimes I had too less idle rotation – 500 rot/min, engine is little shaking, and after few sec it’s back to ~700.
- Yesterday I tried turn off ESP/ABS/BAS in service mode what happen I recorded by phone.
When I pushed acc pedal, the rotation immediately reached to 3000rot/min (manual 1st gear) and nothing more, but what happen with speed You can see on the movie.
YouTube - W203 gearshift
It looks like clutch slipping. When every electronics systems are on it doesn’t allow for this situation and car is moving very slowly.

Can anybody help me? In next week I will visit Mercedes workshop.
What happen when the oil level is too low? It's happen only after braking and stop.