I am facing the same issue intermittently. Did you ever solve this?
No. I went back to using Linksys PAP2 which worked fine with the same exact setup and under the same network conditions.
I have opened up a ticket with Obihai Support just few days back. This certainly looks like something to do with the unit or the firmware itself and I hope Obihai is able to resolve this quickly. I will update this thread once I have an update on this issue.
Sorry for the delay in responding to this message. I was never notified of the updates to the thread.