Solved! Laptop won't connect to the WiFi.

I use a Lenovo laptop. This thing has been happening for a while where my laptop can connect to the internet fine, for a while, after about 15 or 20 minutes, the connection either drops to 1 bar or disconnects completely. When it drops to 1 bar, it either goes back up and continues normally for a short while, or it just disconnects. When it disconnects, my laptop won't connect back to the network i'm trying to connect to. When I try connecting, the list of available connections is gone, all the connections just disappear. The WiFi symbol changes to the symbol that shows when you disable the WiFi. Then after 2 or 3 seconds it shows all of the connections again, and it shows the connection i'm trying to connect to, and it says "Can't connect to this network." and then the connection disappears from the list. It comes back after a while but with no bars, 1 bar, or full bars. But when I try again the same thing happens. I have to restart my laptop so it can connect again. If anyone knows a solution it would be greatly appreciated, since I've been using an Ethernet cable for a while now. (I'm new to this website, so sorry if I did anything wrong.)