RAM Disappearing on M1 Mac mini!

Hi there

I have a really curious error happening on my M1 Mac mini, The RAM disappears! No joke it actually seems to up sticks and disappears, let me explain.

Early this morning I was awoken from my slumber by the audio book I was listening to on Spotify was stuttering really badly and when I looked at my screen I had a pop-up message saying 'Your Mac has run out of Application Memory' along with the Force Quit box so I could try and shut down apps that were running. The Mac was running like it was trying to wade through molasses. Any mouse movement was taking around 5 - 10 seconds before the Mac reacted. This message had also appeared a couple of days ago not long after I had installed Sequoia 15.2 update (that time the Mac was totally unresponsive so I did a hard reboot). Due to that event I already had Activity Monitor running in the background. When I eventually managed to get the Activity Monitor window up I was horrified to see not only the Memory Pressure graph looking like my Mac was having a seizure but next to that it stated that the Physical Memory installed was 0 bytes! No joke (see attached screenshot). No RAM installed and the Mac was operating on life support running a 5GB swap file which explained why the Mac was struggling.

This time I was able to do a soft reboot and since then the Mac has performed perfectly, but how can the RAM just quit like that? If the RAM on the M1 SoC had failed then why would it work perfectly now? Usually if a RAM module dies or a memory controller dies it is usually stays dead, not bought back to life with a soft reboot?

Personally I am wondering if this has something to do with the 15.2 update as it first happened a couple of hours after doing that update and the Mac has performed well up until I did the update but so far haven't seen any other threads expressing similar issues?

As stated I have attached a screenshot, I do also have a diagnostic report I copied into TextEdit which I can post if needed. I have seen before users getting annoyed when large error reports get posted so I will hold off for now posting that unless it is requested.

Any help or insight to this issue will be really appreciated.

TIA

John