I have upgraded motherboard and cpu so everything is a lot faster now than before but it seem whatever I do now on Unreal wether 4 or 5 randomly crashes! does anyone else have this issue?
Hey @phil-davis, welcome to the forums!
Can you post the crash logs? We may be able to figure out what’s going on if we can look at the logs! Next time you crash, bring that back here and we’ll take a look! 
Also, just checking, you did refresh your system’s primary hard drive with a fresh installation of your OS after the new mobo and CPU, correct?