You're on the right track my friend. That coil should last a lot longer than 3 days. While it's not impossible that it could need to be changed, I am afraid that you are experiencing what we refer to as "Vapor's Tongue." It is exactly what you suggested. When you vape the heck out of something you love, you basically become immune to the taste sometimes. However, fear not, for if you take a break from it for a bit you will be able to enjoy it once again. Try to vape something with a significantly different flavor profile. In other words, don't vape another strawberry/cream juice if you want the best results. I avoid this by rotating at least 2 of my favorite juices that have, as I mentioned different flavor profiles. Mine are Cuttwood's Boss Reserve and Juice Maniac's Formula. Which if you like strawberry and cream the Juice Maniac Formula is amazing. It has a more custardy and a bit sweeter flavor, less expensive too. I used to vape Unicorn Milk, but since I found White Label Juice Company's Strawberry Custard to be very similar and only $20/100ml, I can't fathom buying UM anymore. WLJC only does Max VG though.