This error code occurs if you have been signed out of the Playstation Network while playing.
If this happens to you on a frequent basis, we would suggest trying out the troubleshooting steps provided on this Sony support article. As well, our connectivity troubleshooting guide for PS4 might help to resolve this issue.
Please do not hesitate to contact us if the above steps have not resolved the issue.
You can find more information about the possible errors in The Division 2 in our dedicated list of error codes.