Customers on Apple’s online support forum have said the screen on the US$999 device does not turn on when trying to unlock the device to answer a phone call.
Users have complained about trying to answer calls but staring at a blank screen for sometimes longer than 10 seconds without facial recognition or the ‘slide to answer’ function working.
"Sometimes the screen does not turn on and this problem can last for a few seconds or remains permanent until I do a forced reboot," one person wrote on the forum.
Apple has advised customers to restart their phones to solve the problem, which has been caused by a software glitch that is freezing the display.
However, one customer on the company’s support forum said this service as a temporary fix and only lasts for about 15 or more calls.
It is unclear how many people are affected by the issue but the Financial Times reported that hundreds of customers have complained.
iPhone X criticism
The news serves as the latest blow to the iPhone X following criticism that it may not be worth the price tag due to the lack of new technologies compared to previous models and its competitors.
Apple has reportedly experienced a slowdown in iPhone X sales in recent weeks and is said to be planning to cut production.
Last week, however, chief executive Tim Cook appeared to dismiss rumours of sluggish sales of the iPhone X, saying it has been in demand since its launch.
“iPhone X surpassed our expectations and has been our top selling iPhone every week since it shipped in November,” Cook said as the company reported a record quarterly profits.
iPhone battery bungle
Meanwhile, Apple has also come under fire from the US Department of Justice after admitting to deliberately slowing down older iPhones.
Apple has argued that it slowed down the phones to protect the battery and stop the phone from shutting down abruptly in adverse weather conditions.