It's probably time to wash the atty. That's why I alternate 2 attys. Every weekend I switch to a clean dry atty (after I prime it with some
juice) and put the used one in a jar of alcohol (grain alcohol best but I use vodka). I swish the dirty one around a bit in the alcohol, leave in alcohol overnight, and next day I swish then take it out, shake out the alcohol and set on paper towels to dry. The next weekend I switch to that one.
There are quicker ways to clean an atty if you only have one.
The other thing to be aware of is - for me, after 4-5 days of use, normal white cart stuffing starts to taste bad and not wick well so the atty doesn't get enough
juice. At that point I throw out the white stuff and switch to blue foam. You can buy 510/901 size precut pieces at
StrictlyEjuice.com, Flavor Shop! or try to cut your own from marineland Rite-size U foam sleeve from aquarium dept of Petsmart.