Lately I've been having an issue when a zone will stop working. Iro thinks it's running but the valve doesn't actually turn on. Each time I unplug the power from the Iro, remove the faceplate and then put it back on and power it up. The first time this happened I doubled check all the wires, none were loose. This last time I didn't, both times the zone started working again afterwards. I had manually verified all zones were working before this last issue and hadn't touched anything since.
My Iro is a year old and didn't have this problem until the last few weeks. Each time it's been a different zone that stops working while the other 7 are unaffected. The only recent change was to start using all 8 zones, whereas I was only using 6 up until a month ago, though this affects both old and new zones.