Crossfire micro receiver V2 problem

I did this video for the TBS team as I think I have a problem with my Micro Receiver V2
It's not interesting to watch the whole video .
Look at :
The 30 first seconds (sorry for the gliches)
8:10 to 09:30 I'm at 320m on sight of view ans signal is not good
12:20 to 13:00 620m and on sight of view
directly after thet I switch to 500mW to see what happens, en then I fly about 90 seconds all around me (watch GPS distance and RSSI on the center at the top of the image...
14:43 flying around (less than 250m)

I want to specify That we are searching with TBS what is happening, so till we discover it clearly, the problem might be other than supposed.

I'm in EU so the crossfire is set at 868mHz
power = 10mW
Dynamic power off