White LInes Illustrator Anti Aliasing

Hello, I always seem to have issues with this, sometimes things look amazing and other times they don't, there is no rhyme or reason for this. When uploading images of my surface pattern designs from Illustrator to my website or InDesign, as either jpg, png, or pdf, depending on which one doesn't look too hideous because of the white lines, a lot of the time the white lines appear. If I turn off anti aliasing, sometimes, the lines disappear, but then it looks like a hot mess of pixelation. I have also tried to round the output of the vector prior to exporting as jpg, png or pdf to full numbers ie 4cm instead of 4.023cm to try and control the issue, but does not necessarily work all the time. I seemed to have gone a few years with no issues then bam! Issues. Maybe each update of Illustrator influences it also? Is this an Adobe issue or a monitor/proportion issue? Thanks very much.

Bec