Ever tried to run Task Manager in Windows 8 and the graphs weren’t updating? Everything else works, you can scroll through tabs, see running processes, but the graphs for CPU, Memory, Network don’t do anything.
Apparently, Task Manager’s graphs may go into paused status randomly and cause this issue. If you google the issue you will be advised to refresh your OS, loosing all installed applications that are not from Windows Store. Another recommended fix is to scan your OS files using sfc /scannow command.
But if you had the simple problem I had, you only have to do one thing. Open Task Manager and go to View menu on the toolbar, go to Update speed and then select Normal or whatever you prefer. If you are lucky, the problem was the update speed for graphs being set to Paused.
Hope this fix works for you. Ta ta.