CWWK x86Pi-P5/P6 MAX Mini becomes unstable after a few minutes and reboots , fails memtest

If your memory test fails, the most likely causes are RAM incompatibility, a faulty module, or poor contact with the memory slot.

Your mini PC officially supports DDR5 modules from Samsung or Crucial with a speed of 4800 MHz, timings of CL40, and a capacity up to 32 GB (≤32 GB). Mini PCs tend to be particularly sensitive to memory compatibility, so even modules that meet the specifications may not work reliably in every system. Many users get lucky and achieve full compatibility on the first try—yours just happens to be a case with less-than-ideal compatibility. In practice, trying a few different compatible modules usually leads to finding one that works flawlessly.

If you're concerned about other potential hardware issues, you can run a CPU stress test to check for CPU faults. However, due to the existing memory errors, it’s unlikely the test will complete successfully. As a general guideline: if the CPU stress test doesn’t crash within the first 10 seconds, your CPU is likely functioning properly.