this look like a policy specific to your jamf configuration. check polices / scripts / smart groups re FileVault? 

Out of roughly ~1000 devices this is one of the few that is getting the FileVault prompt constantly, so I assuming everything is fine for the most part?

@nnz Look at the Computer Record for the Mac that's having this problem and look under History->Policy Logs to see what Policy is being triggered every week and displaying that prompt. Once you know what's doing that you can determine why, and if it's something you need to address specifically for that Mac, or if it's a sign of problems to come with all of your Macs.