Anannya,
I am using 2 computers with windows 8.1. Dell all in one and HP probook 4540s. The Probook started with windows 7 pro and upgraded to windows 8 pro and eventually windows 8.1. I have an ipad mini, a samsung galaxy s4, dell all-in-one and the probook all on wifi, and only the probook drops connection. The Dell is running windows 8.1 and the probook is running windows 8.1 pro. I have updated the drivers several times on the probook yet still the same problem. I have tried all methods to resolve. I can sign out of the network and sign back in and it sometimes resolves the issue. Other times I have to reset my router to get it to reconnect. This is not my internet or router causing the problem. So, if we can get a fix for this it would be greatly appreciated.