Random Skill Lag?

I'm not too tech savy so hoping someone here can help me out. I've been experiencing random skill lag here and there for the past couple weeks in game. It's happens all throughout different game modes, like in raids, WvW, and me just roaming around different pve maps. What tends to happen is that I click a skill or try to mount and then anywhere from either half a second to maybe a couple seconds later, it activates. I haven't noticed any patterns as to when it happens either. I am also on the NA server if that matters.

Anyone know why it's happening and/or if I can troubleshoot this problem?