Help with monitor

Please help those who can.So there is monitor LG 24MP88HV-S ,to it through HDMI at the same time connected to the PS4 and PC, respectively .The problem is that the monitor is very unresponsive switches from PC to Sonya is not the first times(before I switched the first time)in what may be the cause who can tell?I err on the HDMI cable from Sonya but problems with the image console there are no and buy a new expensive wire just for the sake of checking I do not want!Who else is there ?