Hello Friend, Good that you are seeking a help here. You may be loosing your concentration. Just analyze last few months changes happened in your life and see what are the distraction.
Following few memory excersise and meditation that should help you.
If you don't see any changes even after that, then consult a psychologists for further evaluation.
Health Tips
Do meditation. Place a ear plug to quickly avoid distraction and get into meditation. With this practice your concentration should improve.
Reach me online for further assistance..