Figured you resolved, as I know you never did respond after you mentioned that you would try disabling extensions.
Which if that happens, you should have some crash reports at brave://crashes. Make sure to go there and that they are sent. If not, hit Send Now. Then copy/paste the Uploaded crash report ID here.
Beyond that, you could always try more of the basic troubleshooting as mentioned, like new profile. (which I don’t think you said you tried yet).
All the other little things might have you look at is what I kind of discuss at Browser keeps crashing 2023 - #15 by Saoiray if you want to check it out.
At least need crash report and testing on new profile without extensions. These are two things I know support would ask for you to check.