Windows Explorer integration comes & goes

Keybase GUI Version: 4.7.2-20191026005108+6fc2e969b4

I've not yet been able to identify the trigger for inaccessibility of my "K:" drive, though it could be cumulative running time. My temporary apparent solution has been disabling integration, rebooting, re-enabling that integration, and rebooting again.

Start by reproducing the intermittent loss of access to the K: drive through Windows Explorer integration using the reported GUI version, including the disable/reboot/re-enable/reboot sequence. Done should identify a reliable trigger and restore integration without requiring that workaround; the report names no source files or tests.

Written by the indexing model from the issue text.