Horrible harsh feeling in throat and bad taste even on low wattage.

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Hi, i just joined the forum because i couldn't find any help with this anywhere.
I've been using the same e cig for about 6 months now (cool fire 4) and a liquid which is 70 vg/30 pg without any problems but lately it's been really harsh to vape with even on a low wattage and if i change the coil it's nice and smooth for a day or 2 and then becomes really harsh again. Is it the coil? The liquid? It's really annoying me because i've never had any problems with this set up before.
I asked for...

Horrible harsh feeling in throat and bad taste even on low wattage.

Horrible harsh feeling in throat and bad taste even on low wattage.