Seems Thunderbird is crashing seemingly randomly, because of Lightning...below are the messages from the terminal window.
console.error: Lightning:
[calCachedCalendar] replay action failed: null, uri=googleapi://
lank...@gmail.com/?calendar=fe0nho6nr55g4kkolcc003dh6nedpcv1%40import.calendar.google.com, result=null, operation=[xpconnect wrapped calIOperation]
JavaScript error: jar:file:///usr/lib/thunderbird/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D.xpi!/components/calStorageCalendar.js, line 839: NS_ERROR_NOT_INITIALIZED: Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [mozIStorageStatement.reset]
JavaScript error: jar:file:///usr/lib/thunderbird/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D.xpi!/components/calStorageCalendar.js, line 839: NS_ERROR_NOT_INITIALIZED: Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [mozIStorageStatement.reset]
JavaScript error: jar:file:///usr/lib/thunderbird/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D.xpi!/components/calStorageCalendar.js, line 839: NS_ERROR_NOT_INITIALIZED: Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [mozIStorageStatement.reset]
JavaScript error: chrome://quickfolders/content/quickfolders-bookmarks.js, line 798: TypeError: win is null
JavaScript error: chrome://quickfolders/content/quickfolders-bookmarks.js, line 798: TypeError: win is null
*** UTM:SVC TimerManager:registerTimer called after profile-before-change notification. Ignoring timer registration for id: telemetry_modules_ping