Your RAM is degrading, it will be dead in a few days... Try to put it in the freezer, and see if this will fix it for a while.
It's not worth a RMA in my opinion as you won't get double-sided 16FDx sticks as a replacement.
To be honest I don't think it might degraded in 3 days. Bought it from a dude who have some leftovers from the old double sided series, it was factor sealed when I get it.
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