Multitask menu in ios 7.1
I have an iphone 4s. Ever since I have updated to ios 7.1, I'm facing a problem that sometimes when I press the home button twice it doesn't open the recent apps menu. Rather it simply takes it as simple press of home button two times. Is it an ios 7.1 bug or is something wrong with my phone hardware?
iPhone 4S, iOS 7.1