Zane has lost his memory 3 TIMES.

Once, when Dr. Julien switched it off, when Zane was young.

Next, when, well, who knows (I believe it's Ronin) captured Zane between season 3 and 4 and gave him to Chen for money.

Then last, in the library with Lloyd when Ronin shut Zane off. (That sneaky Ronin. Jeez.)

Of course, were not counting the time Zane had to Rebooted in Hands of Time. #PoorZane