There has been a lot of reporting about a correlation to treating for red bugs and then suddenly they notice AEFW.
I personally have never done an in tank treatment for red bugs, but I did start to pull some pieces and dipping them when I saw RBs. Then about a month later I started losing PE and color on some pieces and then suddenly I was noticing bitemarks on everything.
I think there may be something to the fact that RBs keep AEFW at bay.