Healers treat Move commands as Attack-Move commands

tedster

Healers will constantly stop to heal even when given explicit Move commands. This means that any retreat you make, your healers will stay behind healing your wounded retreating units, themselves, and each other, and then die... and there's nothing you can do about it.

In other games with auto-heals, they only trigger on Attack-Move commands or when idle/right clicked onto an enemy unit. This would allow you to control your healers instead of them committing suicide after 50% of fights.