Took a laptop with Intel 13700H (only IGP, no GPU), which had the same problem.
I disconnected it from Internet, ran DDU, cleaned Intel gfx driver, restarted and installed latest Intel graphics driver v4826.
Still same problem. It runs for a while (4 minutes or so) and then AIDA64 disappears.
AIDA64 stability test GUI is exiting (GUI disappears) but the load is still there CPU is pegged at 100% in taskmanager (aida_bench64.dll).
I'd really like to use a single app for stressing cpu and gpu but I need to look for other tool now.
Could be avoided if user can select opencl GPU(s) in Stability test as well.
P.S.,
It's not the first time I had issues with OpenCL. I think it's not that reliable (probably due to poor driver support, if any).