Lately I have this problem with my renders when after rendering I get weird light effects (fiereflies) especially on walls that are just plain coloured. Like in this render
( It's closed room with 5 area lights from ceiling and one from lamp) I get this effect, especially around and at objects that are "ceramic". I tried different things that have worked in different projects, but with this one seems like nothing works (render was made and denoised with 2000 samples).
Here is 2000 samples without denoising
Thank you for any advice!