so here is my configuration:
-latest TWRP (3.0.2) with F2S support
-bootloader unlocked
-the N6 is rooted
-ROM: AICP MM
2 days ago I tried to reboot to recovery to flash a more recent version of my AICP ROM. I just had the time to see the TWRP boot logo and then the phone rebooted to load the system. I can’t access anymore to my recovery. I tried to rename the twrp directory on the internal SD but it does not change anything.
I reflashed TWRP with ADB and fastboot, but it didn’t resolve the problem.
The only change I made recently was to flash a new radio to try to improve my connectivity.
I flashed 5.34 with the new bootloader in fastboot. Then I tried 5.32 without changing the bootloader and finally the 5.36 with the latest bootloader. So I don’t know when the problem occured but now my phone even reboots randomly !
So if anyone has a solution you’re welcome 
!