Has anyone run across this issue?

Scenario:

Open Prep and connect to a xlsx data data source.  Keep Prep open and leave computer unattended for an hour or so (lunch).  Come back and Prep has thrown an exception on the xlsx data source:

Log.txt file entry:

ID Time Elapsed Key Value

344349 10:32:50.748 - excp class: excel-direct; dse-type: Unknown; excp-msg: Unable to connect to the file "C:\Users\RyanDean\AppData\Local\Temp\1526916295335-0\1913b469-c033-406a-b7bb-ca46176911ba\Data\2df192f7-04ee-4340-8c23-259aef8f5016\MY SALES.xlsx". Check that the file exists and that you have sufficient access privileges for it. ; excp-type: class DataSourceException; is-bad-request: false; is-local-configuration-error: false; is-remote-configuration-error: false; msg: DataSourceException::Throw

Try to Save or Save as... but receive this message:

Log.txt entry:

344514 10:55:59.855 - msg Saving Maestro document fails: : throwable=class java.io.FileNotFoundException, throwableLocation=java.io.FileNotFoundException: C:\Users\RyanDean\AppData\Local\Temp\1526916295335-0\1913b469-c033-406a-b7bb-ca46176911ba\Data\3b066256-4488-4d45-ada7-a6f577746f06\ABA Bestsellers 02-14-18.xlsx (The system cannot find the path specified)

However the file is serialized to disk but it becomes corrupt:

When trying to open BookDemo....error_v2.ftlx this message is displayed:

Note: The will corrupt the original ftlx file had I not renamed it to _error or _error_v2. 

OS and Version info below:

Thanks!