Administration officials said Monday that some visitors to ObamaCare’s federal enrollment site would experience outages, slow response times or messages to try again later during the month of December.

The Centers for Medicare and Medicaid Services (CMS) delivered the message in the latest attempt to downplay expectations surrounding Nov. 30, the administration’s self-imposed deadline for fixing HealthCare.gov.

CMS spokeswoman Julie Bataille said errors that persist past this weekend would be “intermittent” and, in line with a promise made by the White House, would not affect the vast majority of the site’s users.

But Bataille acknowledged that some people would still experience “periods of suboptimal performance” by the system due to either heavy traffic or technical issues that are still being addressed.

“The system will not work perfectly on Dec. 1, but it will work much better than it did in October,” Bataille said.