Updated the firmware about a month ago and it randomly started to shut off for no reason. Sometimes turns off 5 minutes after turning it on, sometimes after 3-4h.

The solution to fix it supposedly was to go into the device configuration and turn off the inactivity flag, but i can not even reach the configuration page, it loads blank.

Tried restarting the app. Sometimes it mentions that the engine is missing as well and i cant launch it from even /Program Files/Steelseries.

any advice what i could try? The frequency of them turning off is rising and becoming really annoying

Please file a support ticket and upload your log files and database (they should reply with instructions).  

Device configuration is missing options. Cant change the "inactivity turnoff" from last firmware patch off