I've just built the latest qosmio-based image. Try it to see if it helps anything for you. Qosmio added a bunch of ath11k patches in his repo. This image has built-in NSS acceleration. Do not enable software offloading with this image.
Thanks! I tried this out and it seems to be an improvement. I was disappointed at first because right after I brought the AP up on radio0 it had the same issue after I connected to it, but after a reboot it seems fine. I tried multiple more reboots and a power cycle and it seems stable.
I'll need to do more extensive testing. I'm a little paranoid since it initially had the same issue before rebooting, but it's promising that I was able to easily get it to work.