Same Problem here...
After trying many things others have mentioned I did the following and so far (fingers crossed) it's working.
I got the idea from Brynnvincible's post, in that high memory use was reported.
I went to 'Task Manager',
Selected the 'Processes Tab',
Clicked on the drop-down arrow for 'Malwarebytes Service',
Right Clicked on 'Malwarebytes Service' and selected 'Open Services'
In 'Services' I selected 'Malwarebytes Service'
Then selected 'Restart the service'
And Voilà, still working so far.