Having similar issues with a ID.4 motherboard. Just blacks out/reboots randomly with a Blizzard 1260, Lyra, Indivision, Subway on clockport, Microys, & 2.5 hard drive attached.
Funny thing is the ACA232 has them all working. I thought the timing fix
was only for this accelerator.
It may be capacitors. I think the fix was done on this board hence ACA working better than Blizzard.
It is not the heat issues as the crashing happens the most when I cold start the machine. (Which now leads me to thinking that some of the capasitors needs to be replaced).
I have also tried to refit the board couple of times to see if it is a bad contact.
The problem it self just freezes the Amiga with no guru or anything just freezes the screen. Sometimes I can go hours and sometimes it crashes in a few minutes or imidiately after boot up.
