[Evolution] Freezing Preview pane

[Anonymous Japhering <japhering gmail com>]

Evolution 3.44.4 (by Flathub.org) 
Linux Mint 20.3 Una
Linux 5.15.0-46-generic #49~20.04.1-Ubuntu SMP

Forth time in the last week that my preview pane has frozen.  

I haven't been watching closely enough to see if it is always the same email message or different 
email messages.

However,  it is a permanent failure.  The pane will remain frozen until I reboot my laptop, which is
the pain point.

Anyone else seeing similar behavior ?

Thanks.