Venue 8 will not remember wifi passwords

My wife's Venue 8 never remember wifi passwords.  When we go to church, she has to enter the password there every week.  When we come back home, it requires the home password.  Sometimes when it's been asleep for a long time and hasn't left the house, it requires the password to be entered too.  Any idea how to solve?

Venue 8 model 3830 running Android 4.4.2

Thanks, Dave