I know it sounds silly, but one possibility is that "out of ideal temperature range" might be too COLD rather than too hot. With the approaching winter, I recently started getting that same message on my ZMax Pro, and the phone repeatedly would not reach full charge after many hours on the charger, but the phone was cold because the heat was not turned on the room and it was below 50 degrees F. Without even unplugging the charger, today I simply held the phone close to my body for 20 minutes or so to warm it up, and it began charging and quickly reached 100%. Somewhat in disbelief, I just now searched the web to see if anyone else has reported this strange behavior in a ZMax Pro and came across your post, so I thought I'd share my experience in case it helps anyone.