First down ink is not fully dry.
Increase drying speed of ink by:
Second down ink, top lacquer or adhesive is too rich, causing first down ink to dissolve.
Check second down material and reformulate for non-aggressive properties. Consult your Sun Chemical representative for a more resistant first down ink.
Foreign object is dragging on wet print.
Trace web and remove dragging object.
Not wiping well; doctor blade issues.
Reset doctor blades to correct contact angles. Replace blades. Check chamber balance – side to side – in and out.