InFocus — Delay in charging

Address:

520008

Sir,
I Had using this #INFOCUS M2 mobile from 15th MAY, 2015 On-wards. past 2 months its working is good .After October my phone had not charging Properly & Though If we charged the phone then it will remains decrease in Charging though we will open it for 2 minutes for 3% Charging is decreasing. I a'm using limited Apps but it totally a bad problem for me . Why it could happening ? Please try to Solve Problem.