My setup (just one month lifespan);
1) EQ14 (Dual 2.5G LAN)
2) TEAMGROUP MP44L 1TB (system disk) in the PCIe x1 slot
3) Lexar NM790 4TB (data disk) in the x4 slot
4) Win11 with latest system and driver updates
Both SSDs have full length silicone thermal pads, I removed the factory provided tiny pads.

The past days my EQ14 started shutting down when I launch WinRAR and start a compression or decompression on the data disk (PCIe x4). There is no blue screen, the Mini PC just shuts down. The PC is new, only one month old and recently started having this issue.
It can’t be thermal issues, both SSDs never throttled even after continous transfering of 2TB of data. The core temperatures using stress tests never go over 80 C, and the fan goes up to 2300 RPM.
Both Nvme drives report no SMART issues. Both are new. Both pass full drive sector test and the file system in not corrupt.
When I launch WinRAR sometimes almost immediately sometimes after a few seconds the PC switches off (no blue screen, no relevant Windows warning/error logs, apart from the obvious “unexpected shutdown”).
I did not chnage anything in the BIOS, I do not use any overclocking/overvoltage etc software. Mini PC has unobstructed airflow.
The PC idles with core temps around 42-44 C, fan 1540 RPM and Nvme drives idle around 41 C.

    d2o
    Hi there，
    Sorry for the trouble. 
    Don’t worry, the PC has one-year warranty. Please send us a picture of SN on the bottom of the PC and a picture of the purchase record. Here are some potential solutions: First, Please turn off the PC , unplug the power supply, and press the CMOS button (if no CMOS button, please put the pin in the CMOS pinhole and press it ) for about 10 seconds , restart the PC after ten minutes. Here is the tutorial https://mega.nz/file/XypwTISY#DVT0BsjOgiPkZ-drQaj88JH9Z7f7qpKGP2E3nMHW8ms or https://url.bee-link.cn/5FdW  If the problem persists, please try other solutions: 

    ①Please change another HDMI cable or power supply.

    ②Please take out the RAM ,please clean the contacts of the RAM with a rubber. Here is the tutorial  https://url.bee-link.cn/AzzB or https://mega.nz/file/7nwDmCaL#UyzSmVkqJG8HW9dhjHhLkkzdP9gt2Br3xyCG1SCdbrA

    ③ Please take out one RAM and leave the other one in it to test if the RAM is defective or not. When testing, please turn on the PC, and wait about one minute, if you can go to the system, Please repeatedly press delete key as soon as your restart the PC, go to BIOS. Go to Boot option, enable fast boot, press F4 to save. 

    ④Please check if the fan spins?

    ⑤Please tell us if the Keyboard light is on ?(Very important). If the keyboard light is on, it should go to the system, we need to troubleshoot HDMI or the monitor.

      1) Like I wrote in the original post I did not chnage any BIOS settings, but anyway did clear the CMOS as instructed - the EQ14 continues to shut-down whenever I launch a compression or decompression with WinRAR
      2) Changed HDMI cable and HDMI socket, also the power cord - problem persists
      3) Cleaned the contacts of the RAM module
      4) This model has only one RAM module. I tested the RAM with Microsoft’s Memory Diagnostic Tool option. No memory problems reported.
      5) The fan spins. When the Mini PC is turnde on you can hear it goes to the highest spin speed untill the PC initializes. During normal operation you can feel the warm air beeing blown out of the coling grid. HW sensor monitoring tools (like CPUID HWMonitor) report the fan speed which varies according to load on the CPU.
      6) This model does not have a keyboard light. The front white Power On LED is on.

      The PC continues to switch-off when WinRAR (v 7.11) starts compession or decompression.

      I am unable to start a private discussion where I can send you the pictures of the serial number and the invoice PDF. Trying to send a PD I get a recaptcha required field missing. Please advice how else to send yoy the serial number and invoice (bough on Amazon Italy).

      d3vil
      Thank you @d3vil for the reply.
      Yes, I had such a suspicion especially because in my case no Blue Screen and no error reporting except the standard Windows one after power-on (unexpected shutdown).
      I am waiting for an official confirmation from Beelink and instructions for next steps.
      Edit:
      In my case the PC shuts-down almost immediately or after 2-3 seconds after I launch WinRAR compression or decompression. From an idle state with idle temperatures. There is not enough time for overheating.
      So the logical explenation is a PSU problem with high load. WinRAR is inherently CPU intensive so it puts a power load on the system as soon as it starts. Power drain protection shuts down the PC.

          d2o
          Sorry for the late reply. You can contact our after-sales team through this email：support-pc@bee-link.com. If it’s a power issue, during the warranty period, we will apply for a power replacement for you.