ever since I downloaded iOS 7 on my iphone

[Ray Hammond]

I keep getting logged out even though I checked the box to keep me logged in.

Never had this problem before.

What's up ???

[Rob DiStefano]

welcome to the wonderful world of totally stupid smart phones - yer not alone, welcome to the "club".  

smart phone computers are not at all like real pc computers, particularly with regards to the web browsers they use.  nothing new, been happening for years and the "fix" may be impossible.  lots of war stories about smart phones on this forum.  

best to refer back to your smart phone vendor and/or wireless provider.