Tryndamere ult not working.

Ok i was just in a game and i died 4 times to a garen who ulted me while i had my ult on and killed me. I even went up and basically fed him so i could watch the timer of the ult to make sure it was still on. and found that he was able to kill me while my ult was up with his. This basically cost us the game because he figured it out and just started rushing me to get his ult off and take me out of the fight since no one else was able to kill me. On another note not sure if its just how laggy the servers have been lately but was having really odd shit happen when tryndamere was attacking moving targets as he kept missing even though full animation was played and they were still in his range. Hell if even made the crit sound since i was fully built and had almost full as and crit.