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segfault at 40 ip...error 14 in sddm (Neon)

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I sometimes get this
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 vgaarb: this pci device is not a vga device
in dmesg.
The screen flashes a lot at boot, and at times I can booted into tty.
Then I can ctrl+alt+f7 to get a desktop environment.
Output of dmesg:

Running a few more times, sometimes it also shows me a segfault which may explain:
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Error: 111.183169] sddm[980]: segfault at 40 ip 0000000000000040 sp 00007fff1f7f8b78 error 14 in sddm[400000+6f000]
Output of dmesg:
Output of cat /var/log/Xorg.0.log:
Any guesses guys? similar problems ... sk_id=1332

Other details:

1. Output of lspci and /var/log/Xorg.0.log .
2. Output of lshw

VGA card:

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$ lspci | grep VGA
    00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07)

OS and kernel:

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 ~  lsb_release -a
    No LSB modules are available.
    Distributor ID: neon
    Description:    KDE neon User Edition 5.8
    Release:        16.04
    Codename:       xenial
     ~  uname -a
    Linux neon 4.4.0-45-generic #66-Ubuntu SMP Wed Oct 19 14:12:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Since this might be related to nvidia:

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  ~  dpkg -l | grep nvidia
    ii  nvidia-361                                      361.42-0ubuntu2                            amd64        NVIDIA binary driver - version 361.42
    ii  nvidia-opencl-icd-361                           361.42-0ubuntu2                            amd64        NVIDIA OpenCL ICD
    ii  nvidia-prime                                    0.8.2                                      amd64        Tools to enable NVIDIA's Prime
    ii  nvidia-settings                                 361.42-0ubuntu1                            amd64        Tool for configuring the NVIDIA graphics driver

Same question: ... e-in-dmesg

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