Your problem is not an electrician can solve, all the wall sockets in the home are the same situation, replace the TV, hair dryer, other electrical appliances can be normal, I think the solution: Go to the main power box to check all the neutral lines and ground lines, turn off all the electrical appliances with signal transmission function, try to see if there is any new radiation equipment, amplifiers, etc., take the mobile phone charging set to the company, or further away to charge (not in a power grid) to see what the situation is, normal conditions, the possibility of magnetic interference is small, 5 times per second. Overclocking hope to solve it soon!