My 645 (non-music) froze on the first run after the update to 3.30. See attached error-log.
I was using the back to starting point function (straight line) while this happened. The watch never froze before,
rtperna : Have you tried a hard reset since the update? At one point with my 235 I started getting crashes when trying to save the config of a watchface change (just one watchface) - possibly some spot of the flash was bad and the OS wasn't handling it well. After a hard reset the problem went away.
Still running 3.10 on my 645. (edited for spelling)