from what I've read, each round of PCR has a chance of copy errors in a small fraction of the samples. after too many rounds, random noise is generated and ampl

from what I've read, each round of PCR has a chance of copy errors in a small fraction of the samples. after too many rounds, random noise is generated and amplified. false positives can occur from this noise if the number of rounds is too high, which is why they cap PCR cycles rather than letting it bake forever.