This started on Tuesday (March 17th). BTT would start using 100% CPU and freeze about a minute after launch (beachball when hovering over the app icon, Touch Bar not responding). Sometimes it would also disable the force click feature of the trackpad.
I have the latest alpha version installed 3.346 (1554). Restarting my Mac doesn't help. The only way to quit BTT in this situation is to kill the process + the relaunch process.
My device is a MacBook Pro (16-inch, 2019) running macOS 10.15.3.