Hi Vanfenel. I think your DKB accelerator is acting the same way the three DKB expansions I have used act, and I hope the solution to the problem is just as simple as it was for me, and a few friends who also have these DKB boards.
First thing to do might be the crash test. Turn your Amiga on and let it boot into Workbench. Bash underneath your desk, around the area where the accelerator is, and see if it crashes. Does it crash when you bump the desk with your knee sometimes? A very common problem with DKB A1200 accelerators and RAM cards is the edge connector. The "teeth" inside the connector become loose over time, and don't bite down on the A1200's expansion edge. When the card wobbles or heats up, the position of the pins might temporarily disconnect from the board and cause a crash and reboot.
The solution, if this sounds like it might be the problem, is to take out the accelerator and carefully (using a sewing needle or tiny screwdriver) bend each of the teeth inside the edge connector inwards, on both sides, so that it bites down really hard. If you do it right the accelerator will be a real bitch to push back on, but at least you know it won't crash so often anymore once it's in there since it's much more securely fitted now. Just be very careful when bending the teeth not to bend them in too far!
