$1 plug to a $10 plug helped mine.
When I opened up the plug boxes in my room the romex was not pigtailed to each plug. It went in one side of the plug then out the other two screws on the other side. I pigtailed each plug in the circuit, them put in a hospital grade that obviously was built better and had more metal in it. I'am fortunate that my house is wired with #12 gage romex. Many tract homes are #14. Just like you cant pull 12 amps through a lamp cord, you cant pull it through a cheap ass plug with hardly any metal in it. Hey, worked for me. $100 plug? Never tried one.
-John