Mine do or have done this, in my case it’s the rubber compound squeaking on the platform sides of the SPD, If I remember I give them a quick squirt of GT85, if I forget I’ve been known to spit a mouthful of juice on out of the camelback, if it’s hot or I’m knackered and I need fluid I’ve resulted to pissing on them, it works for a bit, it’s also worked on a squeaking pivot before as a temporary fix to end the annoying eeeek eeeeeeek eeeek eeeeeeeek half way around wherever, the newer soles that mate to the platform edges on the latest shoe / pedal combo are particularly noisy, it’s the compound of the sole material I think.