Help with online gameplay

someone please explain where i am going wrong. i keep finding myself in game where game does not respond as i intend i tell it to move it dont or i tell it to shoot and it dont. i am normally 50 ping or less i have tried switching controls rebooting etc. this is becoming more frequent and get my ■■■ handed to me when gets in this mode. i like game always been gears fan own them all but if i can not play game way i tell then it becomes more frustrating than fun. any suggestions are welcome