Adobe Audition CC 2018 playback/mixdown problem

Hello,

I am experiencing weird problem. In my audio session for video documentary there are some clips that look perfectly normal. Except when you try to play them random scratching/popping sound ocurs (like audio ending in the midde of sound, no fade out). When playing in waveform view it works well. If I try to play them few times in a row it starts to work better somehow. I really wouldn't mind this problem but it also affects final mixdown. When I play exported mixdown with these same parts, the sound of each problematic part changes from the beginning. It starts sounding like low pass filter and after 1 second it fades to normal. I hope I explained good enough.

What could be the problem? I tried different mixdown settings but problem stays. I also tried pre-rendering tracks and it is the same.

I am using quad core HP Elitebook 8570w with 16 gb RAM and SSD. I use Roland UA-25EX sound card and MME setting in Audition. Latency is set to 250ms.

I would appreciate any help.

Thank you!