Reputable developer sources have told Kotaku that “the Xbox One software development kit—the set of tools that development studios use to facilitate game creation—has been stumbling recently.” And yesterday two other developer sources told the site that “Microsoft found a number of bugs in one of the most recent versions of the SDK.”

Earlier today, Famousmortimer, who’s real name is Pete Dodd — the guy who started the #NOPS4DRM campaign, said that two developers contacted him to reveal that the Xbox One operating system is plagued by bugs that affect applications like party grouping on Xbox Live. Mr. Dodd is well respected on NeoGAF, the popular games forum he frequents, where a lot of his rumors have turned out to be true, the latest being when he predicted two days before Sony announced that Driveclub would be delayed.

One source told Kotaku that as of at least a few weeks ago, Xbox One SDKs were very buggy. Another source said some developers who have already submitted their games to Microsoft for certification have had to resubmit those games with a more recent version of the SDK. “It’s going to be a fun few weeks in Microsoft QA,” one developer source said.

Microsoft has issued responses but none of them directly deal with the rumored problems. One of the firm’s top executive, Phil Spencer, said, “Games are in certification now and we are playing SP & MP nightly,” he wrote. “Anyone can post ‘stuff’ to the web.”

Microsoft spokesman Larry “Major Nelson” Hryb added: “As far as Xbox One, I’ve been testing the OS at home it’s been great.”

To be fair, even PS4 has seen its share of issues, although not as troubling as what Microsoft is experiencing with the Xbox One. For example, there will be a major PS4 firmware update on day one that will implement a lot of the boasted PS4 features, hinting that Sony itself has been working overtime to get ready for the launch of its new console.

So expect things to get all the more heated as we head to November 15th and 22nd, when the PS4 and Xbox One will launch in the U.S., respectively.

Europe sees PS4 on November 29th, one week later than Xbox One.

Most likely not, but Microsoft had to shut down all Xbox One systems a couple times at Comic-Con, reps at the show told SKNR.

According to the site, While most of the crashes were minor, for a good part of Saturday morning, Xbox One demo systems were powered down and replaced with a panel instead while MS tech investigated the problems.

But the interesting point here is now news about the console crashing numerous times at E3 has been unearthed by Pallab Chatterjee of Media and Entertainment Technologies. According to Pallab, during numerous attempted meetings at E3 the system crashed repeatedly, thus explaining why the one-on-one meetings were ended. Pallab also revealed to SKNR that that they had 6 to 7 attempts at meetings and each time the hardware was unable to be stable enough to complete the demonstration and that the issues seem to remain at Comic Con, as this had been an ongoing problem over the weekend.

Even Sony Comic-Con booth people confirmed the Xbox One crashes with much glee, added SKNR.

It’s a bit troubling that Xbox One has been failing so many times at these gaming events but the media has made no mention of it. But more troubling, to me at least, is the fact the system’s already seeing these issues. And one may argue that the console isn’t out on the market yet and we shouldn’t worry, but with Microsoft’s poor track record on hardware, where millions of Xbox 360 systems died through RRoD, this is very disconcerting.