Treyarch’s latest batch of fixes to the PlayStation 3 version of Call of Duty: Black Ops has created a raft of new problems including hard freezes, report players on the game's official forums.

One player writes, “I gave up on [multiplayer] after I lost the first five games I played of the day due to connection failure (post patch). Oh and the frame rate issues.”

Another says that the “patch makes the game unplayable,” reporting that in three hours he or she was only able to connect to five games, “all of which either ended due to connection interuppted [sic], or it froze my ps3 - 4 freezes in total.

“Game multiplayer completely unplayable following the 'patch'.”

For their part, Treyarch lays the blame with gamers’ hardware. Community manager Josh Olin tweeted back at one angry user saying that the issue is to do with strict NAT on his or her router:

"That means your Router has a strict NAT, causing your lag.

“It's not the game.”

Curiously, improving matchmaking conditions for users with moderate or strict NAT was supposed to be one of the patch's fixes:

"Updated handling for UPnP-enabled routers to improve matchmaking conditions where users had strict or moderate NAT types," reads the patch changelog.

Even so, Olin promised that Treyarch were listening:

“We are listening to you and we've been busy working on updates based on feedback from the community.

"We have already deployed a number of updates, and there will be many more to come."