External keyboard stops working after some time on MBP 2020 (Catalina 10.15.5)
To answer my own question:
The problem is not related to either my dongle or my keyboard. The problem seems with USB 2.0 support on the MBP 2020 models.
Currently there is no fix yet (18-06-2020). See link below to an article that describes the same problem.
https://9to5mac-com.cdn.ampproject.org/v/s/9to5mac.com/2020/06/17/users-reporting-usb-2-0-compatiblity-issues-with-2020-macbook-pro-and-macbook-air/amp/?usqp=mq331AQFKAGwASA%3D&amp;amp_js_v=0.1