Hi:
AFAIK, this issue has been fixed with the current
BETA of MB3.
(Instability is to be expected when one runs BETA software, whether it's Win10 Insider or any other beta application.)
It is a
BETA product, but if you wish to try it, there's more information here:
Malwarebytes 3.0 Public Beta Number 3 - Malwarebytes 3.0 Beta - Malwarebytes Forums
Announcing Beta of Malwarebytes 3.0, a Next-Generation Antivirus Replacement - Malwarebytes 3.0 Beta - Malwarebytes Forums
Malwarebytes 3.0 Beta - Other FAQs - Malwarebytes 3.0 Beta - Malwarebytes Forums
If you have a valid license for MBAM2, you can upgrade to the new BETA now.
Or, you can wait to be upgraded automatically when MB3 ships in final, public release build.
AFAIK, the only other robust, real-time anti-malware is Emsisoft Anti-Malware.
However, it is both a fully flagged AV + anti-malware (even though it is called "anti-malware").
Emsisoft has been clear that it ought not to be run alongside another full AV.
So, you would need to disable Windows Defender (if EAM does not automatically do so when you install it).
Also, like MBAM Premium, it is a paid program.
Finally, CryptoPrevent was/is an excellent tool for some earlier types of ransomware. I'm not sure if it still provides the same level of protection for today's variants. FWIW, MB3 incorporates anti-ransomware technology. I cannot speak to any sort of comparison between the two. I merely mention it because the addition of anti-ransomware into the Malwarebytes program is new.
HTH,
MM