"Technical incidents" is a far broader category than "armed nukes dropped on mainland USofA".
I guess we can agree there were a multitude of fuckups that almost resulted in an unintended nuclear explosion, but far fewer events of the specific nature I mentioned.
More than "several". This declassified document goes on for 225 pages, and it's only as of 1967:
https://www-tc.pbs.org/wgbh/americanexperience/media/filer_p...