Mods wear out?

I’ve been vaping the same 2 mods for over a year and 1/2. They are Geekvape Aegis 100watt with Cerberus tanks. I use a couple of tank fulls per day. Lately I’ve been getting short battery charge life regardless of new coil or not, old batteries or new. I recently changed from .3 to .2 ohm coils, does that make a difference? Do these things wear out? I thought the only thing that ever needed replacing was the coil. I have 6 of the same unit in stock. Is it time to replace and pitch?

Original source: