stall

Hey folks! I'm sure these questions are a regular thing so I apologise if its been talked at length before.. I am not new reef tanks, I've had a 50L Nano for 3 years but only recently got my first decent size tank (RedSea Reefer 250)... I'm trying to cycle it using the RedSea Mature Pro kit...

So I have two MP60's on my 300 gallon. After Firmware upgrade Both units are stalling out mostly at night Randomly after the last firmware update. Unplug them they fire right back up. One time it will be the left...the next the right...sometimes both. I have three wet-ends in rotation which I...