Dreamweaver 21.5 keeps crashing while I'm editing.

@cosmorochester.

Did you try these suggestions?

1. Close Dreamweaver.

2. Restore Preferences: 

https://helpx.adobe.com/dreamweaver/kb/restore-preferences-dreamweaver.html

3. Restart your Computer.

4. Launch Dreamweaver as an Administrator.

There have been a lot of reports on the forums of issues with the latest release. First, I would recommend sharing your OS/version so that this can tracked and logged for a fix as it may end up being specific to a particular OS/version. But in the meantime you should try rolling back to 21.4.