See video:
https://www.youtube.com/watch?v=K9y501eikbI
I have three controllers in my setup. One will occasionally not pass any current in bulk mode until I log in and force it to disable/ re-enable as seen in the video. It's like the MPP code fails and thinks the open circuit voltage is the maximum power voltage.
You'll notice it's living at my Open Circuit voltage (130V) until i reset it, and then it properly tracks my Maximum power voltage (100V) afterwards.
Any ideas to fix this?