A number of media outlets and competition winners have reportedly suffered problems with their PS4 consoles.
Kotaku editor Stephen Totilo claims that his first retail unit didn't work due to a faulty HDMI jack, while competition winner and Reddit user Arogon is unable to get a signal.
IGN also experienced problems after updating a working console with the day-one update.
Writing on Twitter, Sony's Shuhei Yoshida said that while the company would investigate the problems, the issues appear to be isolated.
Be assured we are investigating reported PS4 issues. The number is very small compared to shipped, we believe they are isolated incidents.— Shuhei Yoshida (@yosp) November 14, 2013
Kotaku's Stephen Totilo appears to support Yoshida's claims, admitting that four other PS4 consoles worked without any problems.
"In the past week, my Kotaku colleagues and I have used one pre-release PS4 and three retail PS4s with no problems," Totilo explained.
"I've also heard from fellow gaming reporters who've used their PS4s with no problems."
Earlier today, Shuhei Yoshida expressed his disappointment with the PS4 first-party review scores.
While Resogun received largely positive scores, Killzone received mixed reviews, while Knack was criticised by the likes of Eurogamer and GameSpot.
The PlayStation 4 will be available from November 15 in North America and November 29 in Europe.
The console was recently taken apart by a Sony engineer, revealing the internal design of the system.
Watch Digital Spy's hands-on video preview of the PlayStation 4's hardware below: