Rendering time goes up after a couple of frames
Have asus tuf gaming, 3050ti 4gb. Have a moderately complex scene - mostly truck interior. Polycount is quite high, but not too much. No 4k textures, not a lot of materials, 5 area lights. Rendering time for a single shot is around 30 seconds with Optix (main layer, highlights overlayed via compositor and some post-processing stuff: denoiser, hsv and glare).
When i render a sequence rendering time grows to 70 seconds during a couple of frames and stays the same till the end. Sample rate is low: 30. Is there a way to keep it on initial 30 seconds time? Have tried most of the stuff except "headless" rendering and scripting.