Pixelated Textures on Objects

I find this problem comes and goes, its worse when using dds. I never ever edit a dds file I always make pngs and then when I'm sure it's right I convert it to dds and load it in s4s, and still sometimes its looks like its been out in the rain for 3 weeks.
The uv sizes don't have a lot to do with it, its relative for most things unless using a large object or a lot of detail. I thought I read that the game doesn't read objects with a 2048 uv, or it makes no difference, I think EA changed it for object so the largest uvs are 1024x1024, for objects, not clothes I'm sure that's a different bag of cats. (I did have a fridge with a uv that size but I removed as it caused a lot of lag.)
When this happens to me I step away from it for a couple of days, and when I go back it usually has righted itself, no idea why it just does.