Attack Interupts [GAMEPLAY]

Whenever clicking on something to attack it instead of doing so champion either stands still or walks up to object and then stands still. Very noticeable, around a consistent 30% of the time, especially noticeable during last hitting. Also noticed it with spells, not sure if it is the same consistency, still very noticeable, try to q or w and champion will carry out the skill most of the time if not interrupted prior to though may interrupt afterwards. Just seems like random interrupts of player actions, champion results in standstill. Very frustrating.

Was playing special forces GP.