My phone gets switch off

[AC Question]

My phone gets on while charging...when charger is removed screen starts blinking and it gets switch off...also when again i insert charger it shows error and after many attempts it accept the charger..and then it gets on and on screen 'android is starting' comes...optimising apps 1 out of 62 and after optimising all apps phones gets started...i have original charger also...
Please suggest me some way

 

[B. Diddy]

Welcome to Android Central! Which phone? Is the battery removable? If so, try a new battery.