The latest Which? Computing magazine (February 2019) review of Security software suggests that Malwarebytes Premium should be avoided (see page 52 in magazine). It states that "On Windows 10, Malwarebytes appears to battle with Windows Defender rather than complement it".
I reported this to Malwarebytes Support a week ago but so far have not had a response.
I am currently running Malwarebytes Premium 3.6.1 but, in view of this Which? report, I wonder whether I should uninstall it or revert to the free version of Malwarebytes.