Thank you Timo, I have the same feeling as you.
Today I got the same short and unsatisfactory answer from Himedia as you.
I have asked back if this wifi bug is the only thing what is enhanced, improved or fixed in two firmware revisions. - Now I'm waiting for the answer.
It seems all the heavy bugs which make the H8 octa useless for the users are not fixed!?
Half of time I have to use my old player.
I am very disappointed about Himedia's effort to fix the known bugs, e.g.:
Kodi: 2D-MKVs play not smooth and/or are AV asynch with AVR and passthrough.
Kodi: 3D-ISOs play not smooth and blocking artefacts
Kodi: Time jump / time skipping crash very often
Kodi: 3D-BD-ISO movies are not continued at last stopped position
Kodi: Fast- Forward/-Rewind do not work sufficiently
Non QWERTY style USB keyboards not natively supported
From firmware 1.0.9 to 1.1.1 are two releases and the only thing what is enhanced, improved or fixed is a seldom wifi bug???

After more than 7 month the main functions of a media player still does not work!
