Hello.
If you disabled "Always stop walking to Heal" option and Bot stops attacking means it fails once to heal while walking.
Bot stops attacking because it presses ESC to stop walking, as he failed to heal while walking.
So far, Bot is working as it should. I'm afraid if you died it's likely you didn't setup it properly OR Healer doesn't matches your needs.
I'm not saying that there is no improvement possible, but that I don't see anything right now (except the one i will tell). However, feel free to suggest any specific improvements, but other than simply "not stopping walking", because this is necessary in most situations when Bot cannot be used while you walk.
Actually, i noticed an improvement opportunity on ESC pressing, which it will only press ESC if you are walking by clicks (minimap or screen) or attacking using Chase mode (game-client chase creature to attack):
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Maybe Healing will be better, but if Healer becomes worst for some reason then tell me what's wrong and rollback to version "1.1.16-22".
Bot tools were developed to meet the biggest and most common user needs. So if it doesn't work the way you want, create your own Healer using LUA scripts. So you can create your own conditions like never press esc to stop walking before heal or doesn't presses when creature is almost dead and your health is higher than 50%, etc.