I have recently upgraded my Samsung S4 to 4.4.2. I have discovered that my WiFi performance has reduced and frequently I am receiving message " your internet connection is unstable". I can observe that down arrow on wifi doesn't blink at that time. While on the same time other devices like Iphone, ipad, Laptop on the same WiFi are working fine. Can anyone help me in this regard.
In your advanced settings for wifi un check auto network switch. i was experiencing the same issues and this has resolved it. Auto network switch monitors the quality of your wifi and if there are any issues on the wifi it will switch back to mobile internet. Can be a real pain.