My Xperia 10 Single-SIM with the latest SFOS version randomly restarts. I can not see a pattern (time, application or anything else) to point me to a possible cause.
It is very annoying especially if you do not notice it and people try to contact you and your phone sits there with a log-in screen. It does this approximately 3 times in two days or thereabouts.
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Jolla should alert that, let wait for next release
I have that, too. 
I thought, that it happens mostly with Android apps, but once it happened without AD turned on, so this is solely a SFOS problem.
same here with Xperia 10 II
actually it is the first time it happens to me since i have the device. it started after the latest Update 4.6.0.15.
it looks like there are too many failed proceses in the background happening and then the Phone restarts. Does not matter if it is native or androidside the apps are not working stable. Some seem to consume a lot of battery others less. For example the reddit adroid app or other social media apps consume overproportional energy even when they are in the background. and then… restart.