Some suggestions for you - and apologies in advance for any of these things you may have already tried:
- Disable all addons (I imagine you’ve done this)
- Force WOW to use DX11 and not DX12
- Downgrade your graphics drivers
I note you’ve replaced your RAM, but I also wonder if this could be a motherboard issue. Easier said than done, but this would be a logical next step for memory errors.
Have you run MEMTest86 ? This will give your RAM a thorough check - be prepared for it to take some time.
I’ll also link to another thread where someone had similar issues to yourself and they tried many, many different things - some of which may give you some ideas.