What card with what TI chip ?

There is at least one TI Fw chip that I know which is bugged: XIO2200A.

Syba SY-PEX30016 3 Port Firewire 1394B & 1394A PCIe 1.1 x1 Card TI XIO2213B Chipset

Driver says 10.0.17134.1
Texas Instruments 1394 OHCI Compliant Host Controller

Not sure if that answers your question.

Never heard of this option. I switched to the generic one. We will see how it goes.

I'm on Windows 10 Home.

Thanks everyone for the replies.

That Syba card should work properly with the default FW driver and no need to switch to legacy drivers, so I would rather suspect some mainboard incompatibilities. Here is what I wrote about it in the past:

"1. You can get one of the many Syba SY-PEX30016 variants (TI XIO2213B) that are sold under various brand names. The current revision comes with a v2.0 text printed on its board.

The TI chipsets are not true PCIe controllers, instead the XIO2213B incorporates a PCIe-PCI bridge and FW controller in one chip. Performance wise that's not a drawback, but some mainboards/BIOS might be picky about the combination. It's one more bridge that can cause issues, but usually does not.

Startech sells a variation of the same design using some bigger capacitors. Unfortunately they also seem to sell the alternative LSI based card mentioned below on Amazon, using the same product name but at a lower price. They also mix images of both card variants under the same name in their own web-shop."

On a non critical part of my setup I have a firewire tascam FW1804 (for its mic pres via adat). I can choose from 3 drivers. manufacturer, generic and legacy. Of these 3 one works, one sees the interface but can't access it and the other one doesn't even see it. This makes no sense, but whatever it works. So these drivers make a big difference and all 3 are viable options.

I'll probably put up with the crashes for a couple more days here while I get some work done and then I'll switch to the USB connection for my UFX. Though that brings along with it, some horrible audio glitching that I've never been able to resolve. It will work for a while and then gradually there is some audio garble that gets progressively worse over time. The UFX does this on my Mac laptop too which is connected via USB. To fix it on my Mac it is simple. I just change the buffer size up or down, then change it back, and the problem is gone. On Windows, it takes a lot more poking to get it to fix itself. I will change the sample rate, change the buffer size, change the sample rate again, etc etc and then it will finally be back to normal. It always comes back. It's almost like the digital clock is drifting or something but I don't use an external work clock. Or the buffer isn't getting cleaned out? This particular issue ONLY happens via USB.