I was at apples web site and there are issues and 8.1 or 8.01 will be released soon, sounds a bit like Microsoft who had to release 8.1 so quickly after the diabolical windows 8 lol.
So I am not bothering since I am getting the 6 plus in a month and trading in my 4s.
iPad mini and iPad have no such problems although a jail broken iPad Air takes forever to get ios8 on.
Some of the apps have issues too and are being updated to get rid of the bugs.
9 years