Anyone had an issue on iphone 4s where bluetooth connects one day and then the next will not discover anything, but then a little while later it works again? I have 2 audio devices and an apple keyboard that I have this issue with. Effects ALL.

I have an iphone 4s. A while ago it started having issues with bluetooth. All of the sudden, an audio headset I am using quits working with my iphone bluetooth. I check and my iphone doesn't see any of my bluetooth devices. I have an apple keyboard, a headset, and a speaker. Nothing shows up on my iphone but they all connect perfectly to my ipad. Then a day or so later it works again. The are all suddenly there. I just installed iOS7 and I'm still having the same problem. What is UP? Anyone have a clue what is going on?