Zenoss periodically fails to update Windows Data using WinRM

Hello, I am running Zenoss 4.2.5 to monitor several dozen 2008 & 2012 machines via Kerberos Auth., HTTP Transport. Everything is working, but the machines are periodically failing to update their information. When I look at the graphs I see 1 hour or so gaps in disk utilization, etc... Then, it suddenly sarts working again. I have several questions:

1) I enabled Debugging for zenpythoncollector and I'm seeing this message often:
2014-11-10 16:52:56,223 DEBUG zen.windows: OperationTimeout on (System name was here).

I think this may point to the issue, but I'm not sure. It is listed as a debug message, and not error. Can this be ignored What does it mean

Assuming #1 is pointing to the failure, here are my WinRM Settings:

C:\Windows\system32>winrm get winrm/config
Config
MaxEnvelopeSizekb = 150
MaxTimeoutms = 60000
MaxBatchItems = 32000
MaxProviderRequests = 4294967295
Client
NetworkDelayms = 5000
URLPrefix = wsman
AllowUnencrypted = false
Auth
Basic = true
Digest = true
Kerberos = true
Negotiate = true
Certificate = true
CredSSP = false
DefaultPorts
HTTP = 5985
HTTPS = 5986
TrustedHosts
Service

MaxConcurrentOperations = 4294967295
MaxConcurrentOperationsPerUser = 4294967295 (OK)
EnumerationTimeoutms = 60000
MaxConnections = 25
MaxPacketRetrievalTimeSeconds = 120
AllowUnencrypted = true [Source="GPO"]
Auth
Basic = false [Source="GPO"]
Kerberos = true
Negotiate = true
Certificate = false
CredSSP = false
CbtHardeningLevel = Relaxed
DefaultPorts
HTTP = 5985
HTTPS = 5986
IPv4Filter = * [Source="GPO"]
IPv6Filter = * [Source="GPO"]
EnableCompatibilityHttpListener = false
EnableCompatibilityHttpsListener = false
CertificateThumbprint
Winrs
AllowRemoteShellAccess = true [Source="GPO"]
IdleTimeout = 7200000 [Source="GPO"]
MaxConcurrentUsers = 5
MaxShellRunTime = 2147483647
MaxProcessesPerShell = 2147483647 [Source="GPO"]
Recommended: 4294967295
MaxMemoryPerShellMB = 150
MaxShellsPerUser = 2147483647 [Source="GPO"]

2) Assuming #1 is the cause, can I adjust how long zenos waits Will this help

3) Any suggestions for next troubleshooting steps

Thanks everyone.