Kodi crashes on Fire TV Stick

Hello,

i have general a very stable Kodi-Installation with a central Synology and some clients (3 Fire TVs, 1 Win-PC)
Everything works fine and stable for several years – this is also the reason i still use the old Kodi-Version 14.1. – never change a running system…

But now i added an additional Fire TV Stick to the environment and run in some problems.
Kodi starts fine on the Fire TV Stick and everthing looks good – but when i watch a film, after a few minutes (3-5) Kodi is crushing to the Fire TV Stick menu.

Below you can find the log and my actual used advancedsettings.xml:

Log:
http://pastebin.com/ckL7t5Ew

advancedsettings.xml
http://pastebin.com/ngWHX25T

Can anyone help me or have any ides why this happen on the Fire TV Stick?