Issue with File System Task and folder locking

I'm having an issue where a folder that I'm accessing in an SSIS package gets locked up and cannot be deleted by my package later in the process.

1) I use a File System task to rename the folder. At this point, it appears to become locked and cannot be deleted.

2) Later I attempt to delete the folder using another File System task object. I get the error '[File System Task] Error: An error occurred with the following error message: "The process cannot access the file because it is being used by another process."'.

My package accesses the folder via a drive mapping. This seems to be part of the problem, as it's possible to delete the folder directly but not via the drive mapping. Even once the package completes it's still not possible to delete the folder in Windows Explorer via the drive mapping.

I've since rebooted my machine and re-created the network drive mapping and the problem has gone away.