I have problems with my Samsung K Zoom (4.4.2 KitKat) wifi connection.

[AC Question]

Suddenly my phone started not to connect to wifi. When I'm near the router it connects, but link speed is about 20Mbps. So when I go to the other room I lose connection. The phone shows that signal is very strong, but because of low link speed it can't to connect. The others devices in my home works perfect, link speed about 70Mbps. The same problem in my work place with my Samsung. What can be a problem, what can depend on phone link speed?

 

[Rukbat]

I don't know why the phone shows a strong connection when you don't have a signal, but that's what the symptoms are indicative of - the wifi antenna connection went bad, so you have to be near the router for wifi to work. (Put the phone on the router and you should get better speed.)