As the subject header says, my pi3 is now powering itself off after
around 5 minutes, and is then unuseable.

I thought there was something amiss with it a couple of weeks ago, as I
posted on here that it was dead or dying.

It has now gone off after 2 minutes!

Is there anything I can do or check to find what is wrong with it.

--- SoupGate-Win32 v1.05