Symptoms
The SleepAgentServer process may consume 30–100 percent of available CPU time on Microsoft System Center Configuration Manager current branch clients that are running on Windows 10-based computers that have the May 2019 version 1903 update installed.  Multiple entries that resemble the following are recorded in the Sleepagent.log file:
Ignoring heartbeat for new machine {client} with expired DHCP lease 11/23/1981 09:23:50Â Â Â 5/17/2019 9:33:18 AM Ignoring heartbeat for new machine {client} with expired DHCP lease 11/23/1981 09:23:50Â Â Â 5/17/2019 9:33:18 AM Ignoring heartbeat for new machine {client} with expired DHCP lease 11/23/1981 09:23:50Â Â Â 5/17/2019 9:33:18 AM Ignoring heartbeat for new machine {client} with expired DHCP lease 11/23/1981 09:23:50Â Â Â 5/17/2019 9:33:18 AM
Cause
This issue occurs because of DHCP data storage changes that were made in the May 2019 Windows 10 update.Â
Workaround
To work around this issue, set Enable wake-up proxy to No in the client settings.
Status
An update for Windows 10Â is in development to resolve this issue. This article will be revised when the update is available. Â
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References
Plan how to wake up clients in System Center Configuration Manager
See the "Power management" section of About client settings in Configuration Manager
