KWA P226 PTP Shooting problem (With video)

[bakoline]

Hi, I was wondering if you have a minute to look on this video, I have a problem with shooting.

 

It perfectly shoots few rounds and then sort of clicking things happens and upper receiver is not doing a full circle.

 

I was shooting in a warm room, so cold is not a problem here.

 

I tried lubing/cleaning and nothing is changed.

 

Here's the video: https://www.youtube.com/watch?v=ZiznUQlewYY

 

Thanks in advance for any information you can help me