Windows freezing gradually after wake up

Hi. I was reading a post from 2023 here regarding much the same thing as the title and I still can't find a solution to this problem.

I'm fairly new to Windows 11 but this problem started with Windows 10 about a month ago. Since then I've tried just about everything I read, including replacing the graphics card (and drivers of course). Event Viewer seems to come up with something different every time I address a problem and Reliability History much the same. The last "Ahaa" moment was with a Samsung app about 10 years old which I uninstalled, but nothing doing. Everything I've read seems to have various solutions but I'm at my wits end.

Fundamentally the PC wakes up normally after about an hour, but any longer and "bits" start to fail. Outlook seems to be the first (probably because that's my first "goto") followed but any apps that I click on some seconds later, followed by the mouse freezing and a hard reset. It often starts straight away but sometimes a few attempts are needed but it always attempts to start W11 and freezes just before completing. If it gets to recovery mode it always starts.

My sanity is in your hands..