Problems closing retroarch in Fire Stick tv

Hi, I recently instaled Retroarch and DIG in to my Fire tv, after serveral problems, I manage to play in Mame 2010 with a sega retro-bit controler (inser coin, star, ect…), but even if I set up in Retroach a 2 seconds time push of star button to close retroartch, it dont close, I have to go direct to the TV and close aplication manualy. Any idea what im doing wrong? Also Im not able to open menu inside the game. Many thanks for any help