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Thunderbird 91.3 - Hangs entire Ubuntu 21.10 when trying to change time-zone settings for Calendar

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I am running the latest Thunderbird 91.3 on my Ubuntu 21.10 installation. It works like a charm for all my gmail/live accounts and calendars. However in past three weeks, I had to change my time zones frequently - US Pacific, India, US Eastern Standard and Central European and each-time when I resumed my laptop, Ubuntu recognized the local timezone (upon local Wifi connection) and changed automatically. However Thunderbird does not have the same feature and I have to go into Settings and set time-zone manually. Each-time in trying to do so, I not-only found Thunderbird itself to become EXTREMELY sluggish (un-usable) with Ubuntu bringing up Force Stop dialog repeatedly. And furthermore it actually made entire Ubuntu (Chrome Browser and Libre Office apps - that I happened to be running at the same time) unusable and all locked up. I had to force restart Ubuntu and then somehow with extreme patience change the time zone setting in Thunderbird and then leave my laptop attended for quite a while (over an hour or so) and let Thunderbird go through syncing all my accounts (and Lightening sync all the calendars) before the laptop became usable again. Once I went through this process, everything works like a charm again.... Until I have to change time-zone again!

Am I doing something wrong? Is this is a known issue with Thunderbird 91.3? And lastly why an app is hanging the entire Operating System?

I am running the latest Thunderbird 91.3 on my Ubuntu 21.10 installation. It works like a charm for all my gmail/live accounts and calendars. However in past three weeks, I had to change my time zones frequently - US Pacific, India, US Eastern Standard and Central European and each-time when I resumed my laptop, Ubuntu recognized the local timezone (upon local Wifi connection) and changed automatically. However Thunderbird does not have the same feature and I have to go into Settings and set time-zone manually. Each-time in trying to do so, I not-only found Thunderbird itself to become EXTREMELY sluggish (un-usable) with Ubuntu bringing up Force Stop dialog repeatedly. And furthermore it actually made entire Ubuntu (Chrome Browser and Libre Office apps - that I happened to be running at the same time) unusable and all locked up. I had to force restart Ubuntu and then somehow with extreme patience change the time zone setting in Thunderbird and then leave my laptop attended for quite a while (over an hour or so) and let Thunderbird go through syncing all my accounts (and Lightening sync all the calendars) before the laptop became usable again. Once I went through this process, everything works like a charm again.... Until I have to change time-zone again! Am I doing something wrong? Is this is a known issue with Thunderbird 91.3? And lastly why an app is hanging the entire Operating System?