I'm using an ADF4360-9 to generate about 124MHz clock using the divider output. Everything works fine until I cold tested (-40C) and noticed that lock was lost. I narrowed it down to moisture across any loop filter cap by dampening the end of a wood stick and placing it across any cap at room temp, and lock would be lost. Lock would usually restore itself after removal of the moisture or stick.
I thought that the high impedance series resistor in the loop filter may be an issue so I lowered it from 50k to 1k (little effect on the dynamic response) but it showed no improvement. Loop filter is shown below.