Die casting is a complex process that involves several steps and variables, and problems can arise at any stage of the process. Some common problems that may occur during die casting include:

1. Porosity: This is the presence of air pockets or voids in the cast part, which can weaken its structural integrity and cause it to fail. Porosity can be caused by several factors, such as inadequate venting or air entrapment during casting.

2. Flashing: This is the excess material that protrudes from the parting line of the mold, which can be caused by excessive pressure or inadequate clamping force.

3. Shrinkage: This occurs when the metal solidifies and contracts, causing the part to deform or crack. Shrinkage can be caused by several factors, such as improper cooling or inadequate gating.

4. Warping: This is the distortion of the part, which can be caused by uneven cooling or inadequate support during the casting process.

5. Cold shuts: This is the occurrence of a line or plane of weakness in the part caused by the incomplete fusion of two or more metal streams during casting.

These problems can be addressed through various measures, such as adjusting the temperature and pressure, modifying the mold design, or improving the gating and venting system.