I seem to have a similar issue. Unfortunately i have purchased a few more refills for waste i thought that the other one was just running out of liquid. I tried changing to new machine from All out still no go.
The mosquitoes seem to have become immune....
It has always been a pleasure to use this product before and pay a hefty price for it, but now it looks like waste of money.
Batch ID of one such new refill i purchased & tried using U6 295PE/1....
I have switched to Mortien for the 1st time it is working with that...I guess I will have to give up All Out.
Sujoy Kundu (Kolkata, West Bengal).