Mine freezes almost every night I afk, its annoying. It's like a freeze where just the game screen is frozen, but I can still move the characters and click/do things but it doesn't show visually.
I've gotten this since I started 4 & 5 boxing starting back in February or so. The frequency drastically increases in certain Ambuscade and HTBF instances (the Iron Giant ambu and Lilith area, to be exact).
It had been increasing in frequency over time too, to the point where it would rapid fire 2-3 of my characters in the span of a few minutes.
I started trying everything. Fresh install of all computer components. Re-attached all cable connections. Tried underclocking GPU. Tried keeping the fan at 100% at all times. I even added more RAM. Nothing seemed to offer *any* relief. The computer is only 3~ years old and has pretty high end components that SHOULD be able to run FFXI no problem, even 5 characters at once.
After all that, there are two things that offered mega relief. The first, I had all five characters running at 60 FPS. While my GPU can take it, the power supply in my computer could not. I monitored my power supply usage for a week days and while running 60 FPS, all five instances were running "High" to "Very High" power supply usage at once. I pushed all 5 down to 30 FPS and power supply usage dropped dramatically. I instantly saw a huge reduction in my freezes.
I had a power supply from a different computer laying around that was slightly more voltage, so I chucked it in my FFXI PC and saw even further reduction.
The freezing still does happen, but it's maybe once a week to one character, so it's not enough to make me lose my mind. Prior to making the power supply switch/FPS switch, I was freezing 5-10 times a day.
Thanks for coming to my TED talk.