Same here. First time it crashed my PC while I was working. I rebooted and saw the Malwarebytes service consuming all my memory quickly, like a memory leak. I can end the task and it starts up and again starts consuming all the memory. I uninstalled and reinstalled and it again starts consuming all my memory. Right now I have it uninstalled so I can research.
Here is a little from my event viewer
11:08:04 AM, event ID 7045, source Service Control manager, A service was installed in the system and it was mwac.sys
11:21:59 AM, event ID 2004, source Resource-Exhaustion-Detector, Windows successfully diagnosed a low virtual memory condition. MBAMService.exe was the big offender by far, I have 16 GB of RAM and it used almost all of it
11:22:23 Malwarebytes service terminated unexpectedly
11:22:30 AM, event ID 7045, source Service Control manager, A service was installed in the system and it was mwac.sys
11:22:31 AM, event ID 7045, source Service Control manager, A service was installed in the system and it was farflt.sys
11:22:36 AM, event ID 7045, source Service Control manager, A service was installed in the system and it was mbam.sys
11:36:41 AM, event ID 2004, source Resource-Exhaustion-Detector, Windows successfully diagnosed a low virtual memory condition. MBAMService.exe consumed the most
11:41:28, event ID 41, source kernel-Power, The system has rebooted without cleanly shutting down first.
11:41:368, event ID 6008, source EventLog, The previous system shutdown at 11:26:21 AM on 1/27/2018 was unexpected