I found yesterday DS Audio apk 3.15.1 is available
https://www.apkmirror.com/apk/synology-inc/ds-audio/ds-audio-3-15-1-release/
Which seems to be working more or less with Kann Alpha, except that it is still limited to 44.1Khz or 48khz with external DAC (as with any android device like my smartphone without using a dlna renderer like Neutron , USB pro player as renderer of DS Audio,...)... this is a really annoying DS Audio internal renderer limitation.
So, don't expect hires any decoding with DS Audio other than 24bits 48khz, I suppose it's converted from the Synology server (I control the result with the Kann Alpha Toslink output to an external desktop DAC M500 and I can't get 192Kz, as I get with Qobuz or AK Connect).
Basically, now to be almost fully usable at home (and on the way with my smartphone), the only comfortable way to avoid the 10 minutes drops with AK Connect and still be able to listen to Hires files from the NAS, is like an amazing path :
1) The Kann Alpha can, be connected to an Asus or Tp Link extender (placed in the middle of my house to be free to move everywhere) or to my smartphone access point feature
2) The Asus or TP Link extender must be connected to my Galaxy Z fold2 (set as Wifi Access point)
3) my Galaxy Z Fold2 is connected in wifi to my Dlink Wifi 6 MESH or Orange Wifi router
4) Bubbleupnp must be loaded on the Galaxy Z fold2 to give access to my local upnp servers (also it's Publishing Upnp Servers when I want to access with the Kann Alpha on the way to my home upnpn servers with 4G or 5G in hotel, trains, ...)
In this situation, AK Connect is rather stable for hours, though I can't memorize any connection path like any other android or Ios software can do.
This lead to redo the all path to the server library after 10 minutes if you want to change genre, album, artists, etc.. but at least no drops while listening a playlist for hours.
It would be so nice that A&K would allow using directly bubbleupnp apk to replace AK Connect which is so limited in every aspect.
Unfortunately, because I use the Heddphone by HEDD at home and a IER-Z1R on the way, the Kann Alpha is the only available compact DAP with more or less 12V output to nearly move fully this headphone. Sound is a bit behind the Sony WM1A, but still very good and enjoyable.
For a few weeks now, luckily, when I am at home, I can also use, without annoying drops, the Kann Alpha as a simple transport DAP with some limited but more or less sufficient EQ. I just connect the KannAlpha to a M500DAP+Monolith THX887 to get a much better sound quality than any of my DAPs with the HEDDPHONE.
I still didn't have enough time to use fully the A1K CD ripper II, even if the main issue is that you can't listen CD from this item and charge the Kann Alpha via USB-C port.
Unfortunately, my config will not help most of the other users of the Kann Alpha which are struggling to avoid these 10 minutes drops due to AK Connect or Wifi module. As I bought a second Kann Alpha from another country (France instead China) I can clearly say those issues are not depending on the firmware zone (N, M C) or the hardware, but 100% sure it's due to the wifi/lan environment.
... by the way Bluetooth remotes also suffer for a very short standby mode .. I have no issue with 2 types of remote with Fiio M11, Galaxy Z Fold2, WM1A .. and the Kann Alpha again makes the use of the remote quite painfull as we never know it the remote is still active and with to press often twice a button before the command is raelly active.
I have spent so many hours/days trying to configure the Kann Alpha, routers, upnp servers, that I am sure I will never buy any A&K item anymore. So, I will just enjoy as it is now. It's not perfect, but finally usable as it intended to be when I bought this in December 2020.