so everytime you hit click on "Apply" button on the "Adavenced" tab, the clock is resetted to default?
edit:
I've gone through the code and it seems that what happened when you click on apply is the execution of this command:
waas -c /config/advanced.conf > /dev/null
killall monitordcdc
in /config/advanced.conf there's a JSON rappresentation of the data contained in the Advanced tab.
This means that waas command reset all the default value for the PLL. Unluckily there's no source code for waas executable.
Yes, I believe so as the Amps drop.