For my fix, I did the following:
# The 100 cube had a sliver of a brittle plastic-like adhesive that had separated from the circuit board. I broke it off and removed it.
# Since the 100 cube was a bit loose, I cut a small strip of cardboard and folded it like an accordion to build up a stack that I taped together. I used this to wedge in the gap between the top of the cube and the above wall. I then wedged additional pieces of cardboard so that the cube was sufficiently secure and had solid pressure/connection to the circuit board.
# I then used a product called sugru which is moldable silicone and spread little bits of it around the edge of the 100 cube and pressed to secure/glue it to the board. You can use whichever non-conductible glue of your choosing.
# I let the silicone cure for one day and then removed the card board shims. I probably could have just kept it in there but feel uneasy about leaving potentially flammable material in there.
Anyway, seems to be working since sound no longer cuts out randomly since the 100 cube is now secured to the board.