Should be fixed now, can you please try it again after refreshing the page? I just tested it and it should work now. We are on a new server URL so you must re-save your login info via your browser and make sure you keep the box ticked stay logged in.
I keep getting logged out on my phone browser as well, just checked and it did it again. The last time there was an update to the format of the site it made it so it takes at least 5 minutes for me to log in on my phone browser.