Known issueFixUpdated · 3 replies on Steam
Blue Archive: Possible Fix / Reduce for "Ongoing Session" Issue (Workarounds)
Short answer
Suggested fix (unconfirmed): Wait for one minute when the unstable connection message appears, then press the X to close the dialog. Alternatively, click confirm instead of reconnect if you see a poor connection message.
The problem
For the people who are afflicted by this unironic EOS-causing issue, try this out the next time you quit your game: > Go to home screen > Click Menu button at the top right > Click on the Title button to return to title > Force close game (ALT + F4) once you see the PV show up I think this helps close out your session so that there's no session to be found next time you log in. I think you need…
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.