Yeah, historically the music streamer product category has had an issue with hardware reliability (Except KScape and Sonos).
I have had pretty good luck with the MMS-1e. Also having 4 chassis' give you a level of redundancy as well.
Also with (4) MMS-1e's you can set them up as one shared system or as four independent players with separate favorites, etc.
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In general the streaming digital music industry is a disaster, at least regarding integration...? it's truly a 'Lord giveth, Lord taketh' situation at best...
I miss the old CD librarian systems like Audio Request (Though they had major HW issues as well!!!)
I think that pretty much everything these days is unreliable to one extent or another...