Bug#935501: Issue resolved

Upgraded to Kernel 4.19.0-6-amd64 from Buster-Backports and no longer have the issue.

Bug#935501: Further info from syslog

Aug 23 18:45:16 kernel: [ 3988.295876] uhci_hcd ehci_pci ehci_hcd r8169 realtek libphy usbcore usb_common button Aug 23 18:45:16 kernel: [ 3988.295885] CPU: 0 PID: 7166 Comm: kworker/0:0 Tainted: P  D    OEL 4.19.0-5-amd64 #1 De bian 4.19.37-5+deb10u2 Aug 23 18:45:16 kernel: [ 3988.295887