memory - Nonpaged Pool Leak - NDnd Tag - Windows 8.1 64-bit

I have a huge memory leak with the tag "NDnd", which eventually occupies my whole ram (8GB).

Findstr shows me, that hiberfil.sys, pagefile.sys, swapfile.sys or ndis.sys could be the problem.

I'm pretty sure it is ndis.sys, since the nonpaged pool gets bigger with any kind of network activity.
How do I fix this leak?

I have a Windows 8.1 Pro 64-bit system, if it helps.