Thunderbird Hanging/Crashing Since Windows 10 Update

Since updating to Windows 10, Thunderbird v38.1.0 (latest) has been hanging and crashing most times I reply/delete/send an email. I uninstalled and reinstalled Norton 360 using the tool, and that made it work better, but it still happens often. The crashes do not happen when Norton 360 is temporarily disabled. Any ideas on what else I could try to fix this?