Computer Loses Signal Unless Very Close To Router?

About a week ago my laptop started acting strange. I noticed when I brought my computer to my room (which is where i usually use my computer) it said that there were connections available where the signal bar is. Which is odd because it usually just auto connects. So i clicked on the signal bar and connected to my internet, but it lost the connection shortly after so I clicked connect again and it said windows was unable to connect to the router. Then shortly after that it said no connections were available. So i brought the computer to the computer to the family room ,where the router is, to check the router. It was nothing wrong with the router so I looked back at the computer and it was automatically connected to the internet with a five bar connection, but when i left the family room with the computer it immediately lost the signal. So i decided i should just stay in the family room. The next day the same problem occured and i went back to the family room to use the computer but i noticed the connection wasnt usually at five bars like it usually is wen im that close to the router but it was 4 bars or 3.

The next day i went over my fathers house for the weekend, and when im over there i pretty much always have a five bar connection even though im not in the same room as the router because im 1 floor directly above the router. Now when i used the computer over my dads house it had a 3 bar connection, disconnected from the internet at times, and when i try to connect bak it said that windows could not connect to router like it had said in my room bak at my own house, even though it always used to have a very high connection before this problem happened. So wen i got bak to my house i went to the family room to connect to the internet and now im having the same problems i had over my dads house. Now i try deleting some programs to see if they affected the internet and have even turned off some start off services on using mpconfig but that didnt work either