I have an S5 which the WiFi has gone bust, don't really care. However, after, whenever I turn on my phone, 90% of the time it fails to boot, it then reboots quickly twice with 2 vibrations, after the first vibration there is a faint white line just above half of the phones screen, on the second vibration it shows the S5 logo. It is harder to get into recovery than to actually boot the phone but download mode is not affected in any way. Is there any way to fix this?