This happens on every device, mobile or desktop, and when I hit the 'back' button after reading a post it asks if I want to resubmit the form before loading the page. I'd upload a picture but that's a hassle as of right now, so use your imagination of a blank page with that message in the middle every time I visit here.
Edit: Apparently we're being DDOS'd, according to comments. I wondered why it was taking so long to load. All good.
It's a denial of service prevention system, a lot of websites use it to protect themselves from attacks.
We're experiencing a higher user load AND we're under current DDOS.
Check u/Doggos. He's confirmed we're being DDOSed right now.
DDoS protection