The key thing is that you had it before, so it does sound like a bug, but without an actual bug, which points to an immune reaction to something, it doesn't need to be something specific, but hormones usually play a big role, hence more women affected than men. I think 2 years postmenopause still counts as perimenopause (around menopause) so it's possible your own hormones are playing up (ovaries and adrenals).