Frequent logouts with no entry in session log

[Naz]

Hi everyone,

while trying to track the reasons for one of my users' frequent logouts, I've found inconsistencies in the session log. It occasionally misses logouts  - session timeouts for sure, maybe also changed fingerprints. The log then contains two logins for the same user, with no logout in between. We certainly know this is the case after it happened to my colleague (who can confirm her session timed out without it being logged). We also found the session log is missing completely for the months of April and May.

We use the default file-system based sessions and didn't change any logging settings (if they can be changed at all). Our PW version is 3.0.

Does anyone have an idea why some session log entries are missing? A complete one is integral to finding the cause of the logouts, as this would enable us to confirm/exclude causes such as a changed session fingerprint.