sounds like your automatic updates is set for updates at 3-45am
Control Panel\All Control Panel Items\Windows Update\Change settings
and change it to a time to suit you
SERVICE] /Device/Harddiskvolume1/Windows/System32/svchost.exe (wuauserv)
SCVHOST is for services that run via DLLs therefore (WUAUSERV) is the update service.