With the increasing speculation about Hillary Clinton’s health status, a bizarre moment from the primary season is raising new concerns that her campaign is not being forthcoming with her fitness to be president.

While taking a couple questions from the media in June, Hillary Clinton appeared to short circuit like a robot.

Clinton was visiting Uprising Muffins with Washington, D.C. Mayor Muriel Bowser, Del. Eleanor Holmes Norton, and Councilmembers Jack Evans and Anita Bonds, DCist reported.

A reporter asked about Sen. Elizabeth Warren as a vice president prospect, Clinton appeared to short circuit like a robot, her head momentarily thrashing around before posing momentarily to laugh and then changing the subject.

Here is another angle, with the reporter seemingly taken aback by the behavior:

“You guys have gotta try the cold chai,” Clinton said, ignoring their question.