Are you getting a burnt taste on some draws?
This is an obvious indication that your vape is close to running out. It means the vape battery is working, the atomizer is still getting hot, but no vape juice is left in the tank.
This is the case with vapes that use the cotton wick, which starts to produce a burnt taste when the e-liquid is about to be over. So, the battery will heat the device, creating a bad taste in the vape.
As disposables can’t be recharged; if you find the bad taste, although the power is still working, you need to replace the device.