My motherboard is a 2B Revision.
I deleted the files on my CF partition that contained WB, then copied the DH0 image from ClassicWB to it. Then included the statement C:ACATune -maprom * -cache on -burst on >NIL: in the startup sequence. It now seems settled, played a game for a while and then lit it sit idle with the game running and it worked fine. Thanks to all that helped.
Which chip is the one I should cool or attach a heatsink?
Have you set max transfer to 0x1FE00 on the CF card?
4D sports driving is one of my favorite WHDload stability test games, that game seems to crash when I have issues fast as hell, either start a game or let intro loop.
Remove the trapdoor on your Amiga, put a fan blowing on the ACA card, if it's stable after that you know it's a heat issue, run 4D sports driving first without cooling the ACA and see what happens, then put a fan there or something and see what happens, also check the max transfer i wrote above.
Since you have the 2B motherboard as me you might need to do timing fixes but first exclude CF and heat issues