Pro Click left click lags during spray

I bought Pro click a year ago, overall impressed by the product both work (Bluetooth) and gaming experience (2.4 Hz). I'm a heavy gamer and recently started to experience spray lag during FPS (CS GO) gaming. Taping works ok but when in tense situations, when hold left click, sometimes it just stops spraying for few seconds like gun is jamming, with one or two taps in between, then starts spraying again. Switching shooting from left click to right click fixes the problem and other mouses has no issue. So i guess problem is with left click button.