I am consistently getting timeouts at exactly 30 minutes, always with the FFXI-4002 error message. Sometimes I can re-connect via POL, other times it will crash and I have to start from scratch. I bought the game on Steam, this all happens regardless of whether I run POL through Steam or through Windower, which I separately installed. I think I have read all the connection caveats. I'm running borderless windowed and do not change focus. My system is a year-old 12th gen Intel running Win11 with an RTX 3090 GPU, latest driver. I play FFXIV without issue on this same system, as well as many other games including a few other MMOs. My broadband is rock solid.
I have this strange theory the problem is related to my having both FFXI and FFXIV on the same Square Enix account, and FFXIV has a known 30-minute AFK timer. But I'm not logged into FFXIV when I'm playing FFXI. Could Square Enix be confused? Extensive searching has not found any other description of this precise situation. Any advice or pointers would be greatly appreciated.