In this case, the networking with a Debian Buster guest is unstable. I'm getting repeated messages on the console:
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[ 2081:285470 ] e1000 0000:00:03.o enp0s3: Reset adapter
The guest's enp0s3 is an Intel PRO/1000 MT Desktop, bridged to the host's Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller.
I have always used e1000 in Virtualbox machines and never had any issues, so this is a new problem for me. VBox.log is attached.