Hey, thanks for the response. Yeah I did order some replacement, slower ram but I cancelled the order before it was dispatched. I've had a good long 4 hour Satisfactory session tonight and the machine has been stable and has been in fact since I did the reinstall of Windows 11. I've got my fingers crossed that it'll stay this way!
Interesting about the QVL lists, it does beg the question why they bother posting them at all if thats the case.
Again, thank you all very much all your assistance was much appreciated.