[GAMEPLAY] Mana Bar Disappearing And Not Getting Mana Low Message Ingame

Hey Everyone,

Whenever i am in a match on league of legends, usually 5 to 10 minutes in the bar showing how much mana i have disappears without warning as shown in the included screenshot on both bars above my character and on the bottom middle of the screen. Also, i have noticed whenever i am using abilities, i don't get the mana is low message that the character i am playing as says. It seems when this happens i end up being able to cast abilities as many times as i want without those abilities costing me mana. The cooldown timer is the only thing that limits me from using those abilities again. Any help on this would be great.

Thanks, Aerilaya