I've been using my Zowie EC1-eVo for quite a while already (around 2.5 years). I've never had any serious issues with it, only a minor one: occasionally my mouse 4 registered two clicks instead of just one. It wasn't a big deal, just sometimes it made me go 2 pages back in my browser. Recently, I noticed the same issue with mouse 1 (and I think it's not happening with mouse 4 anymore). It's still honestly not that big of a deal but sometimes it's annoying. I also feel like it occasionally cancels Demo's sticky charging, but that's the only in-game issue I could notice so far.
I wonder if there's anything that could fix that (except buying a new mouse) if this issue gets worse.