looking for tips - unstable ide with compact flash and aca 1233

I don't know really what is going on. I have an A1200 with aca 1233 bought back in 2015. I use this machine from time to time since I have vamps in other machines, but it is not as compatible as the aca. I use the scart for video nothing else in the machine.. PSU is meanwell RT65B.

It has been working 100% stable for years. Now two weeks ago I ran in disk errors. Now since then even with other CF card and new install, after moving the CF to A1200 it runs into disk errors. I can't use this system for longer then one hour, and then they are back. Reading the cf card in hdtools gives garbage information on the real A1200. Somethimes recycling the power and rebooting solves this. Somethimes I get the rom and it does not boot.

when I partition and use in winuae (workbench 3.1.4 and betterwb) it remains stable - no disk errors. I tried with MMU tools and without.

I also tested the cf card in windows full format, no errors..

Any advice would be welcomed.

O and most important the 3.1.4 rom is maprommed.

To be honest, I did open the machine and I saw there was a fast ata in the machine, after removing it everything was fine. I did not expect it since I have one elsewhere. I am sure this can only be a second hand one no order history.

Removed and rockstable as expected with the aca.

Maybe save some money, the newer aca's have more ide speed right? How much should MB/second should I get with this one?

It is an interesting faq, and as soon I have some budget for the project i'll buy the ca-psu. However that said ripple is filtered at the power connector and voltage losses can be compensated. Of course this won't be as good as a two unit psu. Good idea, try to google how you did that could be handy for ham radio as well. Not much ripple on scope though. In amiga world they use atx psu these day's, and as far as I see that 5V is more unstable. I had lots of trouble with that.