Why are concentrations low after Library PCR?

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The following sources may contribute to DNA yields after Library PCR that are below the recommended specifications (e.g., 2 ng/µL): 

Source Recommended Steps
Low template concentration Verify that the DNA concentration of the 1st PCR is correctly quantified. 
Repeat the Library PCR with increased cycles of up to 12.
Wrong primer concentration Verify that each sample is amplified with 10 µL of Index Primer Pair.
Wrong thermal cycling protocol Ensure that the correct thermal cycling protocol conditions are used, including temperature and cycle number.

These may occur alone or in combination.

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