Are shifts still being lost due to a lack of crews? Well, there doesn't appear to be a personnel shortage according to NPAS:
Given the current operational bases, how many Pilots and TFOs would be needed to give each base their full complement?
Answer: Pilots, 84. TFOs, 165.
How many Pilots and TFOs do NPAS currently employ?
Answer: Pilots 94. TFOs, 180.