No, it is Not your eliquid!
Don't let anyone kid you in to thinking otherwise.
It is either the way you use your device, or something wrong with your device/coils.
If you do not prime the coils properly, or if you do not inhale with enough airflow to pull the eliquid into and through the coil, you are going to burn the coil out.
If the coil is shoddy from the get go, or the device is outputting higher wattage/volts than advertised, the coil is going to burn out.
It does not matter if your liquid is high VG or all VG, or even all PG.
PG eliquids are easier for low wattage type coils and it is thin and soaks up quickly. VG is thicker and needs more airflow, but as soon as the power hits the coil, heats up and thins out fine.
Now, if your eliquid has sweeteners or oils (neither PG or VG are Oils, they are alcohols that just feel oily) for your flavors, that will speed up the use time of a coil (plus the flavor type oils are not good for you!) and cause them to be coated in a thick coating of baked on crust that takes days or weeks to accumulate. Even normal, good for vaping flavors will coat the coils and it is normal for them to do so!
Anyway, your coil, if of good quality and used properly, on a quality device, should last at least a week and possibly for several weeks.