There are at least 2 variants, it is discussed in the thread you visited already.
From the poll there it looks like the AA variant is more likely to give you trouble than the AB variant. But then again not many people out of the many Fairphone 2 users out there voted in the poll, and I as well as some others have the AA variant and no trouble at all, so it is not a very scientific way to say anything based on that 
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