My hot water pipe shakes when running full open. Any ideas why?

Question

The pipe is anchored fully. It happens only with the valve fully open. It doesn't happen right away. It doesn't always happen. It only happens on one sink.

Answer 1

The water pipe has not been fastened securely to the studs in the wall or basement ceiling  you will have to put pipe clamps on it to hold it from vibrating

Answer 2

I would guess the washer is loose on the stem of the faucet.