How to troubleshoot Sony Xperia 10 iv randomly re-booting

Hardware Adaptation
1

Having now successfully upgraded my Xperia 10 iv to 5.1.0.8 I had hoped that all of the under the hood updates might help with the issue of this phone just randomly re-booting itself several times a day (my Xperia 10 iii and 10 v do not do this).

Unfortunately it did not and this annoying problem still persists. Even more unfortunately, if you don’t notice its rebooted within a certain time and enter the pin code it simply just shuts down.

There is seemingly no pattern to this problem that I can find - it makes no difference if its on charge/ off charge, connected to WiFi or mobile, AppSupport on or off, etc.

What can I do to troubleshoot this issue? Are there any logs I can look at, collect, enable?

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Did you update the binaries after initial flashing?
From my very limited experience on the 10 V, i needed to flash them twice - just once and i had mere minutes between reboots.

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Yes. I updated them to the next version to the one Jolla specify in their SFOS instructions for flashing the 10 iv (after flashing) to see if that would help, but it didn’t.