I'm very happy with my AT&T 32GB GS6, but I'm very disappointed with the fingerprint unlock function. It frequently takes 4-5 tries to get an unlock. Rarely it works the first time. Sometimes it gives up and requires me to enter my password. I have redefined my finger print 3 times (and deleted the previous definitions) and it seems a bit better than at first, but still not good. I'm using my right thumb. Any tips on dealing with this?