Same problem.
Nothing wrong last night, came downstairs to a crashed PC.
Rebooted, system seemed fine.
Then slowdown started and Malwarebytes web protection turned off.
System started running slow and janky, opened task manager.
Malwarebytes was using 62% of system RAM and 28% of CPU. RAM usage was climbing by the second.
Malware bytes ran my system out of available memory, system crashed.
Rebooted, same issue: RAM usage climbs until system crashes.
Quitting Malwarebytes completely resolves the issue.
I am running an Intel Core i7-6770HQ processor (2.6 GHz) and 16GB of DDR4 RAM, with the OS and data on an M.2 SSD. Clean install of Win10 when I built the system two months ago.
It's not a problem with my system, it's a problem with Malwarebytes.