I don't think this has anything to do with imgur.
My scraper didn't miss a single post:
-rw-rw-r-- 1 loyce loyce 872 May 19 07:58 62266221.html
-rw-rw-r-- 1 loyce loyce 1234 May 19 07:58 62266222.html
-rw-rw-r-- 1 loyce loyce 579 May 19 11:06 62266223.html
-rw-rw-r-- 1 loyce loyce 537 May 19 11:06 62266224.html
That means it was down for everyone for 3 hours and 8 minutes.