I have a problem on my 13" MacBook Pro. When I set up Touch ID, it works for 1-2 days without a single problem but after that when I am in the log in screen, macbook is asking for my password and not for the Touch ID. In order to "restart" the Touch ID, I have to delete the fingerprint and add it again.... but it is not very convenient.... what am I doing wrong ? why isn't Touch ID always enabled ? what is causing this problem ?