I've had this stutter/lag/pause (what ever it is) for a long time now. Have avoided it by pausing windows updates and using restore point but this last time I hoped windows update had corrected the problem so went ahead and updated. Big mistake. Not only did the problem reappear but it also deleted all my restore points so no going back. After days of searching for the answer thru all the support sources available I finally found the problem. It was the AMD graphics driver. Once it was replaced by the stock windows driver POOF problem gone.
Heres the sequence and the source of the advice I got.
Go to Device manager> Display device > Properties >Driver tab > Update Driver > Browse > Let Me Pick. And pick basic microsoft driver.
This is the guardian angel source for the advice-- https://answers.microsoft.com/en-us/windows/forum/all/amd-radeon-r4-graphics-driver-causing-micro/370e4b78-c1fa-4180-b2c8-45a100e104b6
Hope this helps others avoid the time consuming headache.
LCK