it took a while to figure this one out.
My wifi router was automatically changing the wifi 2.4MHz channel (when a channel becomes overcrowded).
After observing this for some time I saw the pattern: after the router switches the wifi channels the Aries Mini becoming unresponsive: no longer found in LDS and not responding to the front buttons anymore.
I can also trigger that behavior when I change the wifi channel manually.
For now I’ve set my router to a fixed channel and the Aries Mini has not gone AWOL since then.
None of my other wifi connected devices have issues with the channel change, only the Aries Mini.
I hope this helps and maybe can be fixed in a future firmware.
Ps. the wifi router is a Fritzbox 7490 and meanwhile I’m on R6B3 firmware.