Jupyterhub gets logged out automatically from EC instance

For the past 2 days we has been facing this weird issue wherein one of the user gets logged out automatically of the active session - Python notebook. It happens only for one particular user id and its working fine perfectly for all the remaining. We have installed conda/jupyterhub in AWS EC2 instance/server. Within minutes of logging in he gets logged out. Please advice as to what could be the possible issue.

Hi! Is the user being logged out of JupyterHub, JupyterLab, or Jupyter Notebook?

Hi, the user gets logged out of his jupyterlab automatically.