Ratings goes down.

Hiya

We receive new votes for titles constantly, and we recalculate the average and weighted averages on a regular basis so as a result, ratings will change from one day to the next; they are not intended to be a static, unchanging value.

I hope that helps!

Cheers
Alex

Alex, whilst ratings are subject to change it's very rare that something with almost 1,000 votes drops .7 of a rating due to a single vote. I've noticed that there's been a lot of episode ratings which have dropped drastically (usually those which were rated quite highly) across the board and it's related to a few Top 1000 votes, likely the same voters which are causing problems for these threads:

https://getsatisfaction.com/imdb/topics/score_bombing_of_unreleased_title_by_2_top_1000s_voters_non_us_users

http://www.imdb.com/board/bd0000041/nest/209768807?p=1

The Community episode aforementioned has quite obviously been score bombed (look at the difference between US voters and rest of the world voters for a start, 6.7 vs 9.0) and it appears to be going on across the entire site. For further reference, here's what the score was 2 months ago:

http://web.archive.org/web/20130310000617/http://www.imdb.com/title/tt2383317/

... and here are plenty more examples of other episodes/shows with blatant score bombing:

http://www.imdb.com/title/tt0562998/ratings?ref_=tt_ov_rt (US: 7.5 non-US: 9.0)

http://www.imdb.com/title/tt1851398/ratings?ref_=tt_ov_rt (US: 7.6 non-US: 9.2)

http://www.imdb.com/title/tt2253602/ratings?ref_=tt_ov_rt (US: 7.2 non-US: 9.1)

http://www.imdb.com/title/tt1484414/ratings?ref_=tt_ov_rt (US: 6.6 non-US: 9.4)

http://www.imdb.com/title/tt2562802/ratings?ref_=tt_ov_rt (US: 6.1 non-US: 9.4)

http://www.imdb.com/title/tt1444421/ratings?ref_=tt_ov_rt (US: 8.1 non-US: 9.6)

http://www.imdb.com/title/tt1643647/ratings?ref_=tt_ov_rt (US: 6.1 non-US: 9.5)

http://www.imdb.com/title/tt2325080/ratings?ref_=tt_ov_rt (US: 6.8 non-US: 8.9)

http://www.imdb.com/title/tt2049291/ratings?ref_=tt_ov_rt (US: 7.3 non-US: 9.1)

http://www.imdb.com/title/tt0796550/ratings?ref_=tt_ov_rt (US: 7.6 non-US: 9.4)

http://www.imdb.com/title/tt1640882/ratings?ref_=tt_ov_rt (US: 7.1 non-US: 8.7)

and one of the biggest offences:

http://www.imdb.com/title/tt1831164/ratings?ref_=tt_ov_rt (US: 2.4 non-US: 8.9)

and each of those shows has many episodes which have been score bombed and I bet there's lots of other shows out there with the same problem.

I'm convinced that this is linked with people's complaints in score bombing and should be looked into by the staff, because it looks like somebody's managed to find a loophole within the system and exploited it for their own gain. The TV episodes I think is a good place to start due to the hundreds of votes which could be accumulated from them.

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This is not a problem !!!A top 1000 dont carry so much weight when are so many voters !!!

whilst ratings are subject to change it's very rare that something with almost 1,000 votes drops .7 of a rating due to a single vote.

How do you know it is a single vote?

and one of the biggest offences:

http://www.imdb.com/title/tt1831164/r... (US: 2.4 non-US: 8.9)

The big question there are the 40,000 10 votes (87.5%), which looks awfully like vote stuffing. There does seem to be some of this going on with Turkish shows and movies, see also:
https://getsatisfaction.com/imdb/topi...

it's all because of that http://i.imgur.com/I6ZdDXK.png

about two month ratings was good. now almost every episode and show have many "1" votes