Take it apart and clean out the gunk off the coil by rinsing then dryburning. Have a look at the coil inside after you clean it up and see if the coil is evenly spaced, sunk down into the base like a hammock or the end loops have a high spot. All of those can cause you to have a bad experience and they are all simple fixes.
Pulse dryburn to just as the coil glows to see if it glows evenly, get a pin or tweezers and move wires around a bit and do it again till your happy with the glow, the coil should glow all at once not one side or just the center couple wraps. Carefully lift up the coil a bit so it sits level and also lift up each loop a bit. Once you see inside and do it you'll find that almost every stock coil needs a bit of repair before using it, its best and easiest to do when its new and not had any juice yet.
Make sure the flavor wick is long enough to go from side to side, some protanks and evods the flavor wicks is too short and it floods and leaks. Take a old top wick head and cut the wicks off and use those..trim if necessary.
Once you can smell the wick is burn't after you've dryburned it then chances are its toast, you gotta sence the vape lagging beforehand and clean it before you burn it and the coil will last more than just a few days. I can get a couple weeks off a coil as long as you don't burn the juice into the silica wick.
Any coil from any atty isn't plug and play, they require some simple DIY so you get the best lifespan and vape off of them. Those who just plunk them in, vape a few and then wonder why its such a crappy vape are just asking to get throat burn, dryhits, flooding and leaking and blaming the juice when its the atty's coil, its takes only a few minutes but you will reap the rewards of fantastic vape quality.
Building your own coils is the best way for you to realize that Quality Control in manufactures is non extistant.
I been building my own coils and get weeks off my coils with the proper maintance and by not burning the juice into the wick material.