I am in the good 'ole USA, Arizona, specifically.
It happens only when I am logged in, and has been happening since the forums were upgraded a few months ago.
It happens at any time, but is most likely to happen when I click on the "Activity" link to track the posts I have recently made/responded to. I use Windows 7 and 10 as well as an Ubuntu desktop and both Chrome and Firefox and have noticed this issue across all platforms.
Thanks,