In my model Lumia 640 XL files windows 10 mobile app and Whatapp is not working and i am unable to find my SD card. i am unable to turn off my mobile. i have tried to reset the mobile also.has issue with WhatsApp. WhatsApp application crashes after running any video 2, 3 seconds

  • Does your mobile has latest update, i.e. 10.0.14393.576?
    – Ravimallya
    Dec 22 '16 at 10:08
  • yes i have install the latest update
    – Mathaiah
    Dec 23 '16 at 9:05
  • Whats up is instaled on SD card ?
    – GlacialMan
    Dec 25 '16 at 13:41

First check you sd card in other phone, if it is ok then try hard rest your phone. If the problem persists the i think you have damaged your phone's sd card slot or any internal component is damaged. So if don't have professional knowledge about repairing a phone i will not suggest you doing that yourself. Better take it to service center or any good repairing center.

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