The LG Ultrafine 5K monitor costs almost £900 and is promoted as an external display for Mac devices.
But customers noticed the display flickered or switched off when near a wi-fi router and some posted negative reviews on Apple's website.
LG told the BBC that customers should change the location of their display.
"Monitor arrived today and the picture flickered on or off when using with a brand new Macbook Pro," wrote one reviewer.
