Fountain solution is too acidic
Reduce amount of concentrate or switch to less acidic solution.
Fountain solution conductivity is too high
Remix fountain solution to lower conductivity.
Glazed ink rollers and/or blankets
Clean rollers and blankets, or remove and replace.
Ink is too short
Add a varnish that will make the ink longer. Change ink. Consult ink manufacturer.
Ink has poor moisture resistance
Add heavy body varnish. Change ink. Consult ink manufacturer.