Intermittent fullscreen exit issue

[LuoweiY]

Hello!

I am hosting an online experiment written in JsPsych (version 6.1) on JATOS. The experiment begins in FullScreen mode and exits FullScreen only after all demographics screens have been completed. However, some participants reported that FullScreen mode unexpectedly exited after finishing the first screen of the demographics section (survey-text), even though it should continue to the next screens (survey-multi-choice and survey-text). Interestingly, the majority of participants were able to go through the experiment without issues.

I have not been able to figure out why this occurs. Would you have any idea what might be causing this intermittent issue, and how I could resolve it? Thanks!