HTC India — Phone displayed frequentlly sd card unmounted unexpectedly

Address:

533101

Good morning to all
This is Markandeyulu, iam using HTC desire 828, My phone shows frequently SD card unmounted unexpectedly, my previous complaint no [protected] and IM EI NO [protected], .MY CONNTACT NO [protected], my mail I'd [protected]@gmail.coom..
Iam already submitted my phone in two times but no use.iam in RAJAHMUNDRY only collection point, no service centre. So it take lot of time to rectify, they keep mobile more than twenty days at one time, but my problems not solved, and I contacted service executive they said again surrender the phone at service centre regarding this issue.
Stilll my phone facing same problem