Realtek RTL8188ETV is a 2.4GHz only wireless chip
You are more than likely simply having a very common problem with 2.4GHz interference. There isn't really anything you can do except move to a chipset that gives you 5GHz support.
2.4GHz is very crowded spectrum with lots of noise, so much that when you want to do anything, it suffers.
Run a microwave while on a skype video call and you'll instantly see what I mean 😃
So your solution is to stay hardwire or upgrade to 5GHz chipset or USB dongle.