The Altair discussion dates back to 2017 and I believe Auralic have tried to get to the bottom of the issue from what I’ve read, think they have also tried exchanging some devices.
It was thought to be network card related at one point but then I read that firmware might be suspected, but because it’s happening to different devices I would consider it is hard to actually pinpoint, but that’s just my view.
I have an Aries Mini and just over a week ago saw the same stuck on startup, but fortunately it didn’t appear to be from the same cause as others are reporting, because my issue was tracked back to a certain hires album and once deleted all was back to normal.
All I can suggest is keep watching the discussions and may be do a search for any others, you could also review what firmware you are on and if any beta’s are available. A reset has already been suggested but you could also see if you have recently downloaded any very hires files that you believe could coincide with the start of your issue. Switching from wireless to cable or vice versa is something else that’s been talked about.
The only other thoughts I have is to switch wireless bands, if on 5G then try 2.4, or the reverse, even try re-downloading the LDS app, basically give everything a go and see if you get lucky.
Sorry, but can’t think of anything else to try at the moment.