

I don’t find it surprising at all. Lots of software bugs remain hidden until some circumstance triggers them. Different hardware, different levels of system load, different filesystems… all sorts of things can make a difference.
For what it’s worth, I was using packaged builds on Ubuntu, Ubuntu Studio, and Debian.
Glad you’ve been lucky. :)
I expect MatrixRTC will be capable of screen sharing if it isn’t already, so this is probably just a matter of time, so long as Matrix gets the sponsors they need to continue their work.