Anyone who participated in the beta wouldn't find this information surprising. The first two beta sessions, taking place last Friday and Saturday, were riddled with connectivity issues and various problems. Apparently it was enough to delay the last two sessions, according to the Bandai Namco Twitter account.
"Thank you for joining the second session of the Open Beta Test of #JumpForce. To improve the current online experience, we decided to work on important fixes. For this reason, we need to reschedule the remaining sessions. We will keep you updated about the new dates very soon."
They have yet to announce the dates or times for the "replacement" beta sessions.
While some are frustrated, many are taking this in a more positive light. They believe that it was better these issues were discovered now instead of during the game's official release. What is a beta if not for finding issues with the game, after all?
Jump Force releases on PC, PS4, and Xbox One on February 15, 2019.