In the last few days I have been getting
instead of page results, a few times. Is there something wrong? The error starts with no apparent cause, and after other sucessful searches (results shown) for (also) similar queries, like adding quotes, removing/adding a word or two, etc. After the error happens the first time, it will also happen for queries that worked in the minute before. The error happens on different networks (work, school, home) and varied times (i.e., high load should not be the cause).
An URL of a results page that wasn't working just now, but has worked minutes ago (and probably will work again in some time):