ITA on the not mixing whites with colours. If you went from a top loader to a front loader, did you change detergents too? I know you're supposed to use "lower foaming" detergent with front loaders, so that may be the variable that's causing it. Also, hot (even warm) water makes dye run! Which is why it's especially important to sort your washing You could try adding some salt to your wash for the coloured stuff (about 1/2 a cup) as that will help to "set" the dye, but don't do this if you use your grey water for the garden.