i915 Unstable

Hi everyone, I have a Dell Latitude 5480 laptop with a Fedora 36 install. It crashes regularly, uptime can sometimes be less that 5 mins but sometimes it lasts several hours. There is no trace at all in journalctl of its demise. It behaves like a machine with a memory issue. I've moved the memory from one slot to another and cleaned the connector. I've been using Redhat style systems for over 20 years and have known uptimes of several years. This laptop also boots Win10 and that install is stable. The machine passes Dells internal diagnostics. I'm travelling this week and don't have access to memtest86, but the Win10 memory test passes. Once I'm back home I can network boot it and run memtest86 and FC36 live - which will eliminate the ssd & its controller from the picture. . This machine has a KabbyLake processor (Intel Core i5-7200U 2.50GHz), 8G memory, an Intel i915 (HD Graphics 620) GPU and SSD storage. I've read on various forums that this combination of CPU/GPU can be problematic and some mentions that an upcoming Kernel release may contain a remedy for this. In addition to the FC36 standard kernel, I have tried a 6.0 kernel build and even the development 6.1 kernel from Rawhide's daily builds ( Beta for FC38 ) and its related firmware RPM. Also tried loading the 5.11 kernel from FC34. All with the same results. In fact the FC38 beta kernel only survives a few minutes even without the GUI. Is this hardware faulty, despite Win10 being stable? Does the Linux install stress the hardware in a way Win10 doesent.  Should I hold on for a later kernel release with a fix. Is anyone else experiencing this issue? I'd value any insights. Many thanks Ken -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.