WinRM - Multiple Datasources Disabled

I'm using Zenoss Core 4.2.5 and recently started monitoring Windows Servers using WinRM. I have the latest version of PythonCollector (1.7.3) and Microsoft Windows ZenPack (2.5.4)

I have WinRm configured to run via http and authenticate through domain controller using kerberos. Everything was working fine for a day, when suddenly I started seeing these types of Warning events:

Event Class: /App/Zenoss/

Message:Some monitoring for this device has been disabled due to problems detected in the following datasources:

Device/MemoryAvailableBytes, Device/MemoryCommittedBytes, Device/MemoryPagesInputSec, Device/MemoryPagesOutputSec, Device/PagingFileTotalUsage, Device/ProcessorTotalPrivilegedTime, Device/ProcessorTotalProcessorTime, Device/ProcessorTotalUserTime, Device/WinRMPing, Device/sysUpTime, FileSystem/DiskReadBytesSec, FileSystem/DiskReadTime, FileSystem/DiskWriteBytesSec, FileSystem/DiskWriteTime, FileSystem/FreeMegabytes, ethernetCsmacd/bytesReceivedSec, ethernetCsmacd/bytesSentSec, ethernetCsmacd/packetsReceivedErrors, ethernetCsmacd/packetsReceivedSec, ethernetCsmacd/packetsSentErrors, ethernetCsmacd/packetsSentSec

eventClassMapping /App/Zenoss/zenpython-datasources-disabled

All my graphs for filesystems and CPU are not showing any data anymore.

Does anyone have any ideas as to the cause of this