Fire TV 1st Gen – Black Screen at startup

Hello,
I did not know how to search for this issue, so I’m starting a new thread.
I have a Fire TV box (1st Gen) and I have installed Kodi version 17 and Nightly 18.
When I start Kodi (being in the Fire Tv Surface) me screen goes dark, my tv says there is no signal, and afterwards Kodi starts and the TV goes normal again.
It’s a little bit hard to explain, it’s like: when I start Kodi something happens to the Display output of the Fire Tv, like it’s not sending any signal anymore (or it’s changing something in the display settings) so my TV does not detect the signal for a second or so, and after that when Kodi starts and the TV it’s detecting signal again and I have a Image

This happens with the Kodi version 17 and Nightly 18, but not on 16.1. On 16.1 when I start Kodi it’s like a normal app start, everything smooth.
The issue here appears when I Enter Kodi, and also when I exit Kodi (17 & 18).

Am I the only one who is facing this issue ?
Is there any setting to get rid of this ? it’s really annoying, I had to go back to Version 16.1.

Thanks.
*the Fire TV it’s not rooted, everything stock