Hell I can't stay logged in. I have to relog in 3 or 4 times a day. This site can't seem to deal with people who read the site from multiple devices and browsers. -- I do not, have not, and will not work for AT&T/Comcast/Verizon/Charter or similar sized company.
My PCs have no problem. I don't have my phones/tablets stay logged in for security concerns(running on varied networks), but merely have them store the password. Maybe try that if staying logged in isn't working.