I have disabled add=ons but T/bird still freezes when i try to read/send message. Why?

For the last week my t/bird a/c freezes frequently [but not always] when i open it to read/reply to messages.
In addition logging in to the mail server seems to take at least 2 and often 3 tries before a message counts as "sent" and copying the message to the "sent" folder casues the same problem [sometimes] .
I haveclosed the program and re=opened in "safe" mode ...i e minues the add=ons....doens't seen to make any difference.
The freeze , when it occurs, has "not responding" at the top of the page...sometimes i just leave it for a while , sometimes i close and re-open the prgram.Neither seem to solve the immediate problem. Internet access is NOT affected ...i can browse whilst T/bird is frozen.
Thoughts?

https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#McAfee

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