If you completely turn off and then turn on OpenPli, the WLAN interface is working properly.
I just tested this ‘issue’ on a Duo 4Kse with Develop and can’t confirm this behavior.
As for the Duo 4Kse no Release is available I can’t exactly reproduce this although the hardware seems 90% equal.
It doesn't happen every time the box is rebooted.
But almost always.
I have asked 2 other users of VU Duo4k and it happens with all the images of the OE Alliance.