Attempt to start a session during a flash write
With some client software, an error message similar to this appears on the client console:
Received disconnect from 10.0.12.31: 2: Flash access in progress lost connection
If you attempt to start an SCP (or SFTP) session while a flash write is in progress, the switch does not allow the SCP or SFTP session to start.
Wait a few seconds for the flash writing to finish and then try again.