Multiple Brave crashes in less than 24 hours -- how can I troubleshoot this?

BRAVE has crashed 3 times in less than 24 hours. That includes once (the last one) after a full system restart.

This is very unusual.

How can I best troubleshoot it?

BTW, ‘Clear browsing data’ is grayed out on the hamburger menu. I don’t think I’ve ever seen that before.

Thanks.

Brave Release version / Mac OS Mojave