Something tells me this question is a duplicate of something. I noticed somewhere that accounts can be suspended for 'low-quality contributions'. Could you point out what constitutes a 'low-quality' contribution and why?
Suspensions for low quality contributions are generally tied to a large number of downvoted and/or closed questions (relative to the total number of questions the user has asked, of course). So if you want to know this:
Could you point out the questions that constitute a 'low-quality' contribution and why?
I would throw the question back at you: which of these questions would you downvote, and furthermore which of them would you expect the rest of the community to downvote as well? Which ones would you vote to close and expect others to vote to close?
When we suspend for low quality contributions, it is generally the community that has judged the contributions to be low quality, not (only) the moderators.