I am a little reluctant to try it again since this is a production network. The weird thing is I have other access points with the same config that don't have the problem nearly as often as the others. I believe it has something to do with the amount of interference as this is a very high noise environment.
I have not been using NV2 though (at least not on purpose). This is a hotspot network (clients are various, not mikrotik). The wireless protocol I had was 'unspecified'. Do non-mikrotik clients work with NV2?
From my experience when you set it to non specified runs in whatever mode you were running before the upgrade. So if you were running 802.11 that is what it is going to run. Again the NV2 wireless package flat won't work in 2.4Ghz 802.11 mode from what I have seen. I have tested it across at least 5 AP/Sectors from lightly loaded to moderate and every single one of them locked up at some point in time. Unless you are running straight NV2 the new wireless package doesn't work.
There may be some out there who are using it successfully but I haven't been able to get it to work.
Also no non mikrotik clients won't run with NV2. I would recommend rolling back to 4.16 with the standard wireless package.