Just happy to find this thread after having gone slightly loopy in trying to understand what’s going on with my weeks-old Flint 2.
I went with a hunch and after noting lots of outgoing probes, and uninstalled wwan altogether.
This improved the network experience - almost no hanging requests - but the gl.inet-made user interface is not quite happy.
Mentioning this since it may be of help to the team debugging this.