wifi password incorrect. impossible

Hi,

Suddnely I cannot connect to any netwerk using a passcode (like my own one at home. It worked fine until last week.

I cannot find the solution. I have an iphone 4s with ios 6.1.3.

Furthermore I noticed that connecting to my BT parrot in y car is also not working anymore.

It seems that every device with a passcode or password cannot be reached by me anymore.

Anyone????

Please help. Tried so many things already : hard reset, delete all network settings etc..