Syndra Bugs [In-Game]

When playing Syndra I've experienced issues after casting her ult and also generally moving around the map. For the ult, following every single use the player model skips frames and casting any ability or movement in these freeze frames doesn't respond, resulting in a negative impact on game-play. I've also found that when moving through the direct center of the lane (Including Howling Abyss) there are occasionally invisible obstacles that block pathing. I've checked my FPS while these instances are occurring and its running at 60 fps consistently. This has been an issue for a while now. I doubt that there is a problem on my end because these issues never occur on any other champion.