Try hard resetting your kindle to rule out a software issue. '''Hard resetting your kindle will erase all of it’s settings and data. Back up all of your data before proceeding.'''
# Starting with the Kindle Fire off, press and hold “'''Volume Down'''” and “'''Power'''” simultaneously.
# The Amazon system recovery screen should appear. Use the volume buttons to toggle the selection to “'''wipe data/factory reset'''“.
# Press the “'''Power'''” button to choose the selection.
# Use the volume buttons to toggle the selection to “'''Yes — delete all user data'''“.
# Press “'''Power'''“