are you positive your bird is giving off a wifi feed? As your tx will throw out a 5.8ghz signal, your extender will have a 2.4ghz signal, and your bird will have a 3rd signal also 2.4ghz ( hidden address ) or your MAC address!. So with everything ON, you should be able to scan 2 clean signals, and 1 HIDDEN signal. They will start with 60:60:1f: as it is DJI's unique code, IOS apps don't work, as this tech has been banned by Apple, but android has the InSSIDer app, which works beautifully! But cost $.
But at least you'll know, and it will also reveal your Mac addy to that camera.
It is actually 3 connections being made in your wifi signal.
Connection 1) Phone ( phone talks to extender only )
Connection 2) Extender ( extender talks to phone, AND bird ) back and forth
Connection 3) Bird ( bird talks to extender only )
Any of these connections fail, and you get what your seeing ( connection broken )
The problem is there, 1, 2, or 3?
Next,
If you feel it is an app issue, try to DELETE, and reinstall app! May help! Might help delete a few possibilities from #1?
I would start deleting possibilities? May be a simple fix like ribbon cable not all the way inserted? Or burnt wifi unit, or app issue! Start with the obvious, then move to the bigger items!
J Dot