Haha...talk about a loaded question, the responses will likely be all over the place, leaving the poor guy more confused than ever.
I know very little about the historical documentations of “sick periods” that I’ve heard exist in books such as Min Ron Nee’s, but I’ve definitely observed a distinct, temporary change in taste for the worse, generally in years 1 ½ - 3, in roughly half my boxes. I can’t really offer any empirical evidence that “sick periods” exist, or what may cause them, other than observing what I’ve described. It may simply be subpar storage conditions on my part, who knows. But the majority of boxes affected pull out of it and turn their taste around for the better sometime after year 3.
To further project just how crazy I am, I’ve noticed a common undesirable taste element that almost always signals this temporary decline - if you’ve ever been around a monkeypod tree when the seed pods are going off and falling to the ground, there’s a sickly-sweet odor that I assume comes from the fermentation of these seed pods. Me no likey this smell, and this is often the overriding taste I get.
At least I’m crazy in a harmless way.