Hi, If it's not a workplace computer restricted by an administrator, then I suggest you to update your Windows 10 to the latest version (1903). other people have had such problems with MS Edge and upon upgrading their OS the problems disappeared. it's a relatively new piece of software, running it on older versions of OS can cause unwanted problems. Beta itself is more than 1 month behind Canary channel. (Version 126.96.36.199 VS Version 78.0.256.0) the crash problem doesn't exist in Canary or Dev, eventually all the patches and fixes will reach Beta as well but with a 6 weeks delay.
Yeh, unfortunately can't update Windows. If that is the case then I will have to wait for 6 weeks for updates to come through and see how it goes. I will reinstall Dev channel and use that as it was working okay.