Carlos E. R. wrote:
[...]

With gmail, I notice often when changing location with my laptop that
Thunderbird will not connect. Minutes later I get an email on another
account telling of a security violation on the gmail account, and to
clear it out, I have to login via webmail, see the alert mail, click on
a link, and say F** off, it was me.

This problem has been discussed several times [1] in this group.

Assuming you're using POP (or/and SMTP), you can get around this
problem by using an (Google) App Password in Thunderbird. (If you're
using IMAP, you can also use OAuth2.)

For how to do this, see Ralph Fox' 09SEP2018 post "Google screwed up
my Gmail acct in Thunderbird" in alt.windows7.general:

Message-ID:
or
http://al.howardknight.net/?STYPE=msgid&A=0&MSGI=%3C0ud8pd5m6ler41kl54cdelql2 %3E

Like you, I used to have this problem (for POP), but no longer since
using (Google) App Passwords for my Gmail accounts.

[1] Amongst others in:

From: Frank Slootweg
Subject: Duplicati
Newsgroups: alt.comp.os.windows-10
Message-ID:
Date: Thu, 27 Jun 2019 20:02:09 -0000

or

http://al.howardknight.net/?STYPE=msgid&MSGI=%3Cqf3ed0.buc.1%40ID-201911.user.individual.net%3E