I have and I've seen others have the same criticism. Likewise, "unnecessary running" like, for example, always going to the spot of the foul when you make a decision instead of just continuing into your position when you can see that nothing is likely to happen at that spot. It turns out that refereeing is not just about running your ass off but running intelligently. Luckily, I always get told that I'm doing the last one but sometimes I do get too close to play (especially on the sides where I have an AR to support me).