30 psi is close to the shut-off point on many pool pumps. That's a strong indication of blockage, downstream of the gauge. The blockage could be in the filter, or the piping.
Have you disassembled and cleaned the filter this year? If not, you should.
Here's the Hayward Perflex page and manual
Read this page,cleaning-a-DE-filterbefore you tackle that project. The Perflex is a bit of a bear to disassemble.
Good luck.
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