Having the same issue here Surface Laptop 3 i7 16GB 256GB - was happening on W10 Pro 1909 and still happening on 2004.
Update: I had the hardware replaced and the new unit (also running 2004 with latest updates as of 20/10/20) has the same issue :(.
Update 30/10: I'm also using two external screens with a surface dock issue occurs with both surface dock v1 and v2. I've been running with Outlook hardware acceleration disabled for the past 10 days an haven't had the issue occur since.