Hi Stephane and Jeanfi. Good to see you here.
Please upload your results here. It will take only 5 minutes of your time and help a lot of people:

Type of receiver:
Type of Tx:
PCM/PPM mode?
Region?
Antennas angle and on what plan ?
Left antenna on the xxx axis, right antenna on the xxx axis ( as seen from the front )?

And the data analysis for the flight:

Lowest RSSI 1 rx:
Lowest RSSI 2 rx:
Lowest frame rx1:
Lowest frame rx2:

Average RSSI rx values:
Failsafe ?
losses of feedback communication ( 136/168 events ) for a total of x seconds ?


Lowest RSSI 1 tx:
Lowest RSSI 2 tx:
Lowest frame tx1:
Lowest frame tx2:

Average RSSI tx values:

Thank you so much...