Hi I had my delta pro replaced by eco 3x in a few months too. Seems the firmware update kept messing it up. Then one of the 2 batteries, replaced 2x. Furstrating bc I bought new units and they replace them with refurbished. All was working fine for a few months, then for no reason at all the main unit stopped syncing with both batteries for 3 days. Then all of a sudden started syncing with one of them. This is a very wonky system to say the least. When it is working it is great, but I never feel like I can trust it. Shame