Currently using i7-4650U model of SP3 and have ongoing issue with unit freezing intermittently throughout the day. Does not generally require a reboot, simply waiting 5 seconds or so and the PC responds normally. There is not a specific program that seems to cause the issue. I check for updates at least once a week, so the station is generally kept updated. The unit is primarily docked throughout the day. This is a work computer and am operating for a government agency. Our IT department has not been able to correct the problem, so I wonder if other users have also had this issue. Any suggestions would be most appreciated.