For the past few weeks I've been getting lag spikes whilst playing league of legends. Characters occasionally stop moving on my screen for a second or two, and then jump into new positions as the game updates itself. Typically this happens several times per game, and it seems to be worse at peak times.
Generally my ping to the game is quite low, and I don't see any issues playing othr similar online games such as "Heroes of the Storm". I also don't see any unexpected network activity from my PC, so I don't think it's any other programs I'm running.