red/green light blinking

Formuler z7+

i'm resseler and this is box from one of my client he say: ''after 10 month, the box shut down once a week...and 1 month later it's every day.''

so,

i do the factory reset and all update, every things fine now.

but when i start-up, the red and green light flashing for about 5 time then the green light still but i have black screen...

i push the STB button on remote to switch in eco mode and i push again the stb button on the remote, and the image appear and every thing work fine ! but i must do this every time i shutdown the box.

any idea ?

i.e. i try different tv, hdmi cable, power supply and remote, nothing work.

Thank's

i test on 3 differente place and 3 different tv, with 3 differents hdmi cable.

And i have to switch between eco mode with remote button stb many time before the image pop-up...