Was getting the same thing every other page load 2 nights ago. Only getting it occasionally today. Located in the US.
Also noticed a similar problem with 2 tabs open. Get a message about loosing connection on one tab then the 503 usually happens. If I stick to one tab don't seem to get it.
Hmm, i did have multiple tabs open, but most were in 503-state, waiting for next try to actually load and for me to read what is hiding under interesting title ...
just a hint: replace steemit.com with steemd.com and leave the rest of the link intact and there you go, issue solved ;)
of course for voting and others you'll have to use cli but still you can read all the posts
The one 2 nights ago was with one tab open. Didn't start using multiple tabs until later.