Try disabling everything in MSCONFIG except your AV and Firewall and reboot.
Work with your system for the hour and see if this carries on.
If the problem seems to have gone,go back to MSCONFIG and add one tick at a time and ok,go through the list of startup programs one by one to till you get what maybe a conflict somewhere...this may identify the problem.
Start/Run/type MSCONFIG/select startup
Alternatively try the system file checker
sfc /scannow ( note the space / )
Understanding sfc click here