The site loads fine for me. If you want a 3rd party site to test it for you, you can always use the https://www.isitdownrightnow.com/ which will tell you if its your connection or something actually wrong with the site?
I haven't gotten your error before on PD but I've gotten it before on other sites and the reason is usually a poor wifi connection. Basically the connection is frozen and the router is trying to reestablish the connection and the site detects that you are offline.
Try a differnent wifi channel with less interference or if you got some mining rigs near by then just use a CAT5 network cable and you will never get this issue again.
Its ok now, the problem was on PD's side as I checked their facebook page
"We are going to have a brief 5 minute downtime while we do a stability upgrade for our services. We thank you for your patience."