5.8Ghz Cards vs 2.4 Ghz mavlink issue

i have tested Alpha 036NH / TPlink 722 combination and works fine, but the MAVLINK doesn’t work in 5.8 GHZ cards like Netgear 1900, AWUS036PCM dual band type wifi cards.
my second problem is that the streaming from Pi to Mission planner works great for 10 Seconds and then freezes and after 10 secs the original MP HUD appears with the telemetry etc working just fine…i have tried all versions of Gstreamer with no affect.

can anyone help…