Last week I started to forget what locker I was in as I kept riding and re-riding attractions at IOA and US. I actually had to get help from the locker guardians to get into the lockers, once because the computer wouldn't recognize my fingerprint and once because I forgot the number. I also had problems with the touch screens. I was later told by one of the locker guards that using my finger nail worked better than the pad of my finger in touching the buttons. I also determined that if I took a picture of the computer screen that showed what locker I was supposed to utilize, if I forgot the number, I could just look at my picture and remember which locker I used. Turned out to be a lot less stressful.