I have discovered that problem occur after installation of hyperion (with WS2812 LEDS connected to GPIO18) . I have repeated this behavior on latest raspbian as well.
This has been already reported: OSMC 2017.07-1 incompatible with Hyperion? - #15 by penfold42
The origin of problem is ws281x library.
Solution:
add “dmanum” parameter in hyperion configuration:
// DEVICE CONFIGURATION
"device" :
{
"name" : "MyHyperionConfig",
"type" : "ws281x",
"leds" : 132,
"dmanum" : 10,
"colorOrder" : "grb"
},