it might be the tablet. sometimes i have to re-log in on the tablets. they don't always hold the log ins.
Yep, Jennifer is correct. In order for the "keep logged in" to work, you have to allow cookies. There may be a setting on the tablet to do that. If not, then there is no way to stay logged in because it's not the site that keeps track of that. Instead, it is the cookie that is kept on your device.