Sony released a notice today saying that certain PlayStation Vita titles are having issues connecting to PlayStation network server.
The company says that it has confirmed problems for one game at present. Dynasty Warriors Next freezes in its Engi Mode and Souha Mode when a message is shown indicating that the game is trying to connect with the server.
As a temporary fix, Sony suggests that players switch the Vita's network setting to off before playing Dynasty Warriors Next.
Sony is currently working on a firmware update which will fix the issue. This update will be released in the coming days.