Hi Tom,
I had this occurance when I started out with my new win10 pc.
I cannot remember the exact resolution which caused these errors to cease but here are a few of the things I did do:
Re-seat the firewire card to another slot not shared by ssd
reinstall firewire drivers from the device manager
plug the paca in to the other 800 slot on the firewire card
ensure the cables are seated correctly
update Paca to latest firmware
I’m sure you’ve tried the above tips but in addition:
Sometimes it’s best to start the PC after turning on Paca and Audio interface
and the key solution I always use now if the pc is already running is to turn the Audio interface on first then the Paca
If I remember something else I’ll update my post