Having meta keywords is not the issue so remove or keep it, I say keep it as some older search engines still use it.
I will tell you what happened to one of my sites as the exact same thing happened on one of them, and it was down to duplicate content on other domains. I removed the other domains and my site after 8 days or so returned back in the serps.
Is your domain still showing in google when you "domain.com", and have you checked webmasters for any manual spam actions?
It seems very similar to what I have experienced, and I am thinking having your content translated on other webpages is the issue here.
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