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Thunderbird freezes after about every third email I send (OS-X, 68.6.0 (64-bit))

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Whenever I send email, there's about a 1 in 20 chance that Thunderbird will just freeze (permanent spinning ball on OS-X). The menu doesn't work, etc. Force Quit appears as an option if I right click on the icon for the app, which triggers the Apple Crash Reporter, but not the Mozilla Crash Reporter.

It seems to happen most often when I am replying to an email; it also happens when I am in safe mode (although maybe that reduces the frequency of freezes?).

Whenever I send email, there's about a 1 in 20 chance that Thunderbird will just freeze (permanent spinning ball on OS-X). The menu doesn't work, etc. Force Quit appears as an option if I right click on the icon for the app, which triggers the Apple Crash Reporter, but not the Mozilla Crash Reporter. It seems to happen most often when I am replying to an email; it also happens when I am in safe mode (although maybe that reduces the frequency of freezes?).

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I have an Apple crash report, but I can't seem to attach it to this issue.

Also, one more note. The spinning ball doesn't seem to appear until I close the message (hitting the small x on the tab) for the message I was replying to.

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have an anti virus checking mail? Sounds like the sort of symptom they can cause.

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I don't. All of my virus checking is cloud based, before the email reaches my email client.

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What did you find to be causing the problem? Does the problem go away if you enable hardware acceleration at preferences > advanced > general?

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I have not found the problem.