FINALLY one with the exact same issues I have.
My original thread was this one: Video freezes with scrolling - #4 by EvilDragon
But yours explains the issues a lot better.
I can confirm the Gurus (yep, same numbers), the lockups, the freezes!
And it happens especially often when something is scrolling. Either when browsing through the music list of EaglePlayer, reading through a guide or simply just catting a text file on the shell.
And yes, not using the ZZ9000 graphics modes but switching to the Amiga ones makes the Amiga perfectly stable.
With FW1.9.1 I had the crashes almost every 2 minutes, so my Amiga became useless. Now I’ve updated to FW1.11 - and the Amiga worked without a single crash for over 30 minutes. So it’s a LOT better.
But yes, then the same thing happened that happened to you: It started to crash more regularly, and in the end, it crashed again every few minutes. Or as soon as the desktop shows up.
So while FW1.11 makes things better, after a while, the system becomes unstable again.
I checked with ZZTop and at the beginning, the core temp was around 55°C and at around 69°C when it started to crash. Is the temperature already too high? Or should that still be safe? I can install a fan, if need be.
My Amiga is a stock A4000/040. I’ve got a new power supply in there and am booting via an IDE->SD adapter, all caps have been replaced.
The board is still one which has the Buster soldered.
I have not tried running the board outside of the case, but the same board works fine with a PicassoIV card and passes every DiagROM check. I have three working 4000 mainboards and they all behave the same, so it can’t really be the mainboard itself.
The question now is: What’s happening? And how can we fix it?
As FW1.11 got a lot more stable, it seems to be something that can be fixed in software.
One thing I noted: When I do the Bus test in ZZTop, half of the screen gets messes up with lines. Is that supposed to happen?
It passes all bus tests.