I can reproduce a very similar intermittent connection pattern on Opera One Stable 136.0.6008.52.

Environment:

Windows 10 Pro 22H2, OS Build 19045.6456 Opera One Stable 136.0.6008.52 Browser Connector enabled and already connected to ChatGPT

In a fresh test after the connector was already working, I observed this sequence:

list-tabs -> success tab-content -> success list-tabs -> "Browser not connected" history -> "Browser not connected" structured tab-content query -> success list-tabs -> success tab-content -> success list-tabs -> "Browser not connected"

I did not reconnect the Browser Connector, change permissions, restart Opera, or sign in again between these calls.

So in my case the connection is not permanently lost: it can fail, recover automatically without user action, and then fail again shortly afterward.

I also reproduced the same behavior before and after updating Opera to 136.0.6008.52.

I have submitted the same finding through Opera's official Desktop Stable bug-report form as well.