Flavour fade is common. Most of the time it's the coil, not the bottle.

This is the most common cause and the easiest to fix. Coils mute flavour as they wear out. Sweet residue builds up on the cotton, the metal gets a film on it, and the same juice that tasted bright two days ago tastes dull. Flavour can fade well before the pod actually tastes burnt. If your pod's a few days old and the flavour's gone soft, swap the pod or coil and see if it comes back. If it does, that was it. The pod-longevity guide on the hub goes through what shortens coil life if this keeps happening fast.

Sweeteners build up on coils faster than fruit or menthol does. The first day or two of a sweet juice can taste amazing. Then the residue starts to muffle it. Doesn't mean the bottle is bad. The same juice in a fresh pod will taste sharp again. If you keep noticing a flavour go flat after two or three days, it's probably the chemistry, not the bottle. Some people just buy spare pods and rotate through them when they're running sweet juices.

Your tongue gets used to a flavour. It's a real thing. Vape the same juice for a week straight and your taste buds adapt. The flavour becomes background. People call it vaper's tongue. Strong menthol or heavy koolada in the rotation can also dull your sense of taste for a bit. The cooling shuts off the warmer flavour notes. Dry mouth makes it worse. Switching to a different flavour profile for a couple of days usually resets it. Drink some water. Eat something with a strong taste. Most people get their flavour back within a day or two.

Cold liquid wicks slowly. If you brought your kit in from the car in winter or pulled it out of a fridge, the juice is thicker and the cotton can't pull it through. Give it ten minutes to warm up. The opposite happens in heat. Hot devices thin the liquid out and you can get flooding instead of clean vapour. Low battery is another one. As the battery drops, the coil fires weaker, vapour gets thinner, and weak vapour means weak flavour. Charge it up and try again. If your kit's at full battery, at room temperature, and the flavour's still flat, it's not the device.

The chemistry has to match the kit. Thick high-VG liquid in a tight pod doesn't wick properly. The cotton stays half-dry and the flavour comes through muted. Freebase juice in a tiny pod can feel rough but doesn't deliver clean flavour the way salt nic does. Salt nic in a big direct-lung kit is the other side of the problem. Way too much nicotine, and the flavour gets buried under throat hit. The salt-nic-vs-freebase and choosing-your-first-vape-kit guides on the hub break down which goes where. If you bought juice for a different style of device than the one you're using, that's likely the issue.

Quick checklist. Replace the pod or coil. Wipe the contacts inside the pod bay with a dry cotton swab. Charge the device. Refill the pod and let it sit five minutes before pulling. Switch to a totally different flavour profile for a day. Drink water. Stop chain vaping for an hour. If the flavour comes back after any of these, you found it. If you've tried all of them and it still tastes like nothing, then maybe the bottle's off. Most of the time, it's not.