Unable to refresh the System Settings on the device

I can see the device in ZCM with green, I can ping the device by IP
If I run zcm rereg GUIDspecifiedhere it shows that the GUID is taken by a device

But the device completly stopped responding to anything ZCM related 2 days ago (yes, it was rebooted in between)

I could unregister it & re-register, but would rather understand what happened

[DEBUG] [05/24/2013 10:57:03.971] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:57:04.148] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ParseArgs. Result = SUCCESS] [] []
[DEBUG] [05/24/2013 10:57:04.150] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:57:17.267] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:57:17.267] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [Before call to ProcessCommand] [] []
[DEBUG] [05/24/2013 10:57:17.284] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to ProcessCommand. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:57:17.284] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to ParseArgs. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:57:17.285] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:57:24.351] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:57:24.352] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [Before call to ProcessCommand] [] []
[DEBUG] [05/24/2013 10:57:24.364] [1368] [ZenworksWindowsService] [57] [] [ZMD] [] [Processing Command for handler reregister] [] []
[DEBUG] [05/24/2013 10:57:24.402] [1368] [ZenworksWindowsService] [57] [] [ZMD] [] [Finished Processing Command for handler reregister. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:57:24.402] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to ProcessCommand. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:57:24.402] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to ParseArgs. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:57:24.403] [1368] [ZenworksWindowsService] [57] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:57:34.537] [1368] [ZenworksWindowsService] [57] [] [Full Disk Encryption Module] [] [Module statusStopped] [] []
[DEBUG] [05/24/2013 10:59:06.289] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:59:06.289] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ProcessCommand] [] []
[DEBUG] [05/24/2013 10:59:06.299] [1368] [ZenworksWindowsService] [54] [] [ZMD] [] [Processing Command for handler reregister] [] []
[DEBUG] [05/24/2013 10:59:06.307] [1368] [ZenworksWindowsService] [54] [] [ZMD] [] [Finished Processing Command for handler reregister. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:59:06.307] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ProcessCommand. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:59:06.307] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ParseArgs. Result = ERROR] [] []
[DEBUG] [05/24/2013 10:59:06.308] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:59:20.011] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:59:20.205] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ParseArgs. Result = SUCCESS] [] []
[DEBUG] [05/24/2013 10:59:20.206] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:59:35.185] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ParseArgs] [] []
[DEBUG] [05/24/2013 10:59:35.185] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [Before call to ProcessCommand] [] []
[DEBUG] [05/24/2013 10:59:35.194] [1368] [ZenworksWindowsService] [54] [] [ZMD] [] [Processing Command for handler refresh] [] []
[DEBUG] [05/24/2013 10:59:35.225] [1368] [ZenworksWindowsService] [54] [] [ZMD] [] [ResendLocationUpdate : -1] [] []
[DEBUG] [05/24/2013 10:59:35.320] [1368] [ZenworksWindowsService] [54] [] [ContentManager] [] [metadataUpdatedNeeded = False] [] []
[DEBUG] [05/24/2013 10:59:35.525] [1368] [ZenworksWindowsService] [54] [] [Settings Module] [] [Unable to refresh the System Settings on the device.] [] []
[DEBUG] [05/24/2013 10:59:36.995] [1368] [ZenworksWindowsService] [54] [] [ZMD] [] [Finished Processing Command for handler refresh. Result = SUCCESS] [] []
[DEBUG] [05/24/2013 10:59:36.995] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ProcessCommand. Result = SUCCESS] [] []
[DEBUG] [05/24/2013 10:59:36.995] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to ParseArgs. Result = SUCCESS] [] []
[DEBUG] [05/24/2013 10:59:36.998] [1368] [ZenworksWindowsService] [54] [] [CLM] [] [After call to StopDisplaySpinner()] [] []
[DEBUG] [05/24/2013 10:59:41.111] [1368] [ZenworksWindowsService] [56] [] [Full Disk Encryption Module] [] [Module statusStopped] [] []
[DEBUG] [05/24/2013 10:59:48.773] [1368] [ZenworksWindowsService] [56] [] [ZMD] [] [ResendLocationUpdate : -1] [] []
[DEBUG] [05/24/2013 10:59:48.874] [1368] [ZenworksWindowsService] [56] [] [ContentManager] [] [metadataUpdatedNeeded = False] [] []
[DEBUG] [05/24/2013 10:59:49.066] [1368] [ZenworksWindowsService] [56] [] [Settings Module] [] [Unable to refresh the System Settings on the device.] [] []
[DEBUG] [05/24/2013 10:57:03.328] [3580] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []
[DEBUG] [05/24/2013 10:57:16.620] [5028] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []
[DEBUG] [05/24/2013 10:57:23.707] [7144] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []
[DEBUG] [05/24/2013 10:59:05.602] [6648] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []
[DEBUG] [05/24/2013 10:59:19.346] [6980] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []
[DEBUG] [05/24/2013 10:59:34.503] [5884] [zac] [1] [] [ZenCache] [] [SqliteConnection:Setting for Asynchronous IO operation to sqlite DB read from registry is null so setting it to default to true] [] []