I have the same problem on my BV 7000 PRO. The screen is blinking and per moment the screen become black and i'm forceed to reboot it.
I live in France. The BV 7000 PRO don't propose me to make update by OTA when i check news update, it said me your phone is up to date.
i have the firmware : BV7000_PRO_Blackview_201700523_191854
For update it to lastest firmware BV7000_PRO_Blackview_20170919, must i update the firmware step by step :
start by update firmware BV7000_PRO_Blackview_20170622 to upgrade from 6.0 to 7.0
continue to firmware BV7000_PRO_Blackview_20170712
then to firmware BV7000_PRO_Blackview_20170717
and finish with firmware BV7000_PRO_Blackview_20170919
This method will fix the problem ?
thank you for your future answers
PS ; sorry if my english is not perfect and understandable