Windows Defender File Path White Listing
Flowmatrix requires the following paths to be white listed:
\\Servername\Data$
\\Servername\Workspace$
\\Servername\Logs$
\\Servername\Bin$
If the paths are not whitelisted, then it's possible for Windows Defender to block files coming into the server.
In the case of one customer, we experienced envelope jobs getting locked and resulted in the job not splitting properly (in addition to suspending in error).
There are two places that you can set the whitelist, although the 2nd of the two options will be what ultimately worked previously:
1. Whitelist in the windows settings:
Search "Windows Security".
Virus and Threat Protection
Virus and Threat Protection Settings
Exclusions -> Add or remove exclusions
Add the full paths here.

2. Whitelist in the registry:
Search "Registry Editor".
Navigate to following path: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
Add the following values:

DWORD type - value set to 0. It should look like the above screenshot.
(Adjust the paths depending on the server).
Server Restart required.