Sometimes simpleminer reboots itself, could'd find a reason because I cannot find any logs, after it comes back on sometimes one graphic card is not initialized:

[    7.332060] amdgpu 0000:06:00.0: runtime IRQ mapping not provided by arch
[    7.332270] amdgpu 0000:06:00.0: enabling device (0000 -> 0003)
[   15.728039] [drm:atom_op_jump [amdgpu]] *ERROR* atombios stuck in loop for more than 5secs aborting
[   15.728062] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing E18C (len 428, WS 8, PS 0) @ 0xE2D7
[   15.728080] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D3DC (len 256, WS 4, PS 4) @ 0xD4DB
[   15.728097] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing B304 (len 290, WS 12, PS 4) @ 0xB3D7
[   15.728114] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing ADA4 (len 144, WS 0, PS @ 0xAE1B
[   15.728116] amdgpu 0000:06:00.0: gpu post error!
[   15.728118] amdgpu 0000:06:00.0: Fatal error during GPU init
[   15.728120] [drm] amdgpu: finishing device.
[   15.765939] amdgpu: probe of 0000:06:00.0 failed with error -22


01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
02:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
05:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
06:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
07:00.0 USB controller: ASMedia Technology Inc. Device 2142
08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev cf)
08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0
09:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev e7)
09:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device aaf0


System is composed out of 6 x RX470 and one RX580, both 8GB cards.