I end up rebooting SailfishX on the Xperiax once a week or so when the browser gets messed up enough that it won't work at all, or worse: renders the phone unresponsive with a steady green or red LED. Like mosen it sometimes requires the red-button (power and volume-up) reset.

As far as Stellarium, version 0.3-1 from openrepos works fine on X for me (the documented landscape issue notwithstanding).

ed. Forgot to mention the rare occasional spontaneous reboots that seem to only occur in the middle of the night when that damn Sony white screen is bright enough to wake me up.