FWIW, I had similar issues with my BDP-1 locking up (with no Jitterbug). I never did get a satisfactory explanation. I moved to a BDP-2 and have never had the problem since, which leads me to believe that it may be a memory or processor overload issue. i seem to recall the memory utilization being 98% shortly before the BDP-1 hung.
Given that the only reasonable explanation seems to be that the later versions of MM are just too much for the BDP1 specs, is there an archive where you can locate earlier versions of MM, so you can try out the major releases and pick one that works best?
I remember about a year ago where I was having no issues at all, my BDP1 would run for months on end without issue, I think it was a release starting with 2016.
Is this possible, as I don't use any advanced features and only have the bare basis activated, USB, samba, mpd, etc.