I accidentally downgraded.
Had a problem with my original 4S. I still have 2 months on my warranty, so I went in to Apple. Got my phone swapped out. My new 4S has 5.1.1. On my original 4S, I upgraded to iOS 6 and lost my jailbreak. Even though I liked iOS 6, I missed my jailbreak.
Last night, I jailbroke my 4S with greenpois0n and I'm back in business. I got SBSETTINGS BACK!!
So, if you are still under warranty, and notice your 4S is having ANY problems at all, get it swapped and you'll be back at 5.1.1