I’ve been getting something similar to Todd. When I try to access the site on Safari on my iPhone, I get that blank page.
But when I open a “private” browsing window, then I can access the site normally.
Getting a lot of these too. The site often will come back if I press "reload" a couple times, but it's as if the 502 error is the default first thing to load each time I click on something within the forum.