It may be necessary to strip down barrel and mold to verify flow path is free of contamination or dead spots. Increase inject pressure, and, if possible, clamp pressure. Reduce inject pressure and inject speed to produce a slower rate of fill. Wet resin due to poor air circulation on dryer. Clean filters on dryer.
Parts are over packed.
Reduce inject speed and or inject pressure. Reduce drying temperature. Barrel and manifold temperatures are too high. Reduce barrel and manifold temperatures. Lower gate temperature.