

Dear Arnold community,
Lately I've been running into this issue where my 3ds max Arnold render shows me some weird artefacts. Those "dead pixels" don't have any alpha. And i can tell they're not fireflies oder otherwise clipped information since they appear randomly all over my rendered .exr. I can't explain how this happens. I'm rendering about 40 similar shots and most of them are just fine.
A bit more information:
- Rendering with 3ds max 2018 and Arnold
- HDRI used for image based lighting and reflections
- AA and glossiness clamping activated but I rendered similar shots to this one where it didn't seem to be a problem
- 6, 4 ,3 rays
Would really appreciate it if someone could help me. 
Cheers
Robin