If you are using an Apple device (phone, macbook, etc.) and your theme keeps resetting from Dark to Light every 7 days or so, here is why. Note the workarounds at the bottom.
@staff_Jim you da man! Thanks, I will have to try that.
We will see, I think I had the first workaround applied. The second, happens like a drug habit.
I guess my solution works: stay online forever, do not close your browser.
As I have not seen any light theme for a long time on my Macbook