[Issue With Archwing Flight]

Feeling your pain. I have noticed this happening Every time a host migration occurs, I lose my ability to fly up or down. Ive seen other people in the same match fly fine afterwards though, Perhaps it only happens to the new Host? The only vertical movement i could manage, was strafing backwards while holding jump, and it slowly pushed me downwards

[Archwing - Red Circles Causing Conflict]

I have had this issue many times too. Though as you say, being the Host or doing it solo you dont seem to have the issue. I think its in combination with the Invisible Enemies bug, which also seems to be clients only. Ive noticed if i sit there and spam odanata's radial blast skill. you can still knock them out of the circle and capture the point for a few seconds, so there is probably an enemy there that only the host can see. I think even moving away from the point, the invisble enemies will still follow you, allowing you to lure them away and cap the point afterwards. Works for me most of the time.