Problem with AWACS in F4AF

[vektorboson]

Being a Falcon4 newbie, I hope some of you veterans can help me out.

My problem is with the AWACS in F4AF; the radio calls from AWACS have random volume, and I can't hear the replies (if there are any) to my requests (Picture, Declare or others).
It's definitely not about radio range, since sometimes I hear AWACS very loud and clear, and the next second you can bearly hear them. When I ask "What's the picture?', there's a longer radio pause, as if they were answering, but the volume is very low. AWACS works, since after takeoff they are answering loud and clearly to, only after some time I get those sound problems. Any help on this issue?