while ( true ) loop issue finding image in loop

My problem is after the fist successful loop it seems to stop recognising the image so maybe its the way I've written the script? It always works first time it sees the image then stops recognising the image after the 1st loop.

Here is the code:  (first time coding too so any help would be great)

REG = {}

-- Ankulua
TIMEOUT = 3
SIMILAR = 0.8
WIDTH = 1080
HEIGHT = 1920

ROOT = scriptPath()

DIR_IMAGES = ROOT .. "images/"
DIR_LIBS = ROOT .. "libs/"
setImagePath(DIR_IMAGES)

-- Ankulua settings
-- ---------------------------------------
Settings:setCompareDimension(true, WIDTH)
Settings:setScriptDimension(true, WIDTH)
Settings:set("AutoWaitTimeout", TIMEOUT)
Settings:set("MinSimilarity", SIMILAR)

luaLib = loadstring(httpGet("https://raw.githubusercontent.com/mercobots/luaLib/master/luaLib.lua"))
luaLib()

commonLib = loadstring(httpGet("https://raw.githubusercontent.com/AnkuLua/commonLib/master/commonLib.lua"))
commonLib()

--Main start--

while ( true )
do

if(exists("hatch.png"))
then
click(Location(547, 1132))
wait(11)

click(Location(528, 1779))
wait(2)
click(Location(539, 1780))
wait(4)
click(Location(237, 1572))
wait(3)
click(Location(781, 182))
wait(2)
click(Location(213, 529))
wait(2)
click(Location(572, 1402))
wait(2.5)
click(Location(146, 1393))
wait(1.5)
click(Location(551, 1800))
wait(1)
else
toast("image not found")
wait(30)
end
end