I've been running the free version of MWB for about a year on a PC running Windows 10 Education 64-bit. On 4/9 I received a message indicating that an update existed and opted to install it. I was surprised that the update also installed the Premium Trial version in the process, considering that my 14-day trial was over many months ago.
I leave this PC on 24x7, and on the morning of 4/10 I found it to be unresponsive. After several minutes of trying to get to where it could be gracefully shut down, I gave in and held down the power button until it powered off. On 4/12, this happened again, and again on 4/13. On 4/13, I ran chkdsk in case all of the ill-advised power-cycling had created new problems - it was running when I left for the weekend.
On Monday 4/16, all seemed OK - chkdsk claimed not to find any problems and the PC was working. Then on the morning of 4/17, the same issue occurred. On 4/17, I uninstalled MWB and on 4/18, all was OK again. On 4/18 I reinstalled the Premium Trial v3.4.5. On 4/19 (today), the PC was unresponsive again.
Reliability Monitor shows one MWB crash on 4/10, the morning after the update, but none since then:
4/10/2018 3:58 AM
Faulting Application Path: C:\Program Files\Malwarebytes\Anti-Malware\mbamservice.exe
Problem Event Name: APPCRASH
Application Name: mbamservice.exe
Application Version: 220.127.116.113
Application Timestamp: 5ab294e4
Fault Module Name: arwlib.dll
Fault Module Version: 18.104.22.1683
Fault Module Timestamp: 5aa00e7b
Exception Code: c0000005
Exception Offset: 00000000000740a9
OS Version: 10.0.16222.214.171.124.256.121
Locale ID: 1033
Additional Information 1: d8c4
Additional Information 2: d8c441bd4da5afc4fe4d1382535a0af4
Additional Information 3: e237
Additional Information 4: e237b1077cfe4cdb6fa9f1a1f1352556
Extra information about the problem
Bucket ID: f8ebba856b271b24a932adb7713cbe29 (1815704603174157865)
The only other AV on this machine is Windows Defender, and it has been running on it "forever". It seems the 3.4.5 version of MWB is at odds with something on this PC, causing it go comatose in the middle of the night, and I'm looking for a cure that doesn't involve the power button. TIA for any assistance.