Slackware current, i know, all the time was telled "not very stable, development" and so on, but with time i get accustomed, even current on slackware is quite stable and good.
but some time ago i installed slackware64 current on my work desktop. it was quite good hardware -i7 cpu, 16 Gb RAM, ssd as boot, and two 1tb hdd in software raid1.
i use xfce, and about once in a week, average, i got crashed X and back to black screen.
what was much worse - all opened things, dolphin instances and so, also was gone - as so, as some things who i work on at that crash time.
last crash happen about 20 minutes ago, when i try to open small .txt document on kwrite via dolphin, from my connected usb flash.
i start again xfce via "startx", but -again... that was a pain. i encounter that more than month by now. i do slackpkg update and upgrade-all quite often, but nothing changes.
a two weeks ago i do full hardware test -test all HDD and SSD-s with HDD regenerator programm, and do memtest86 and memtest86+, as cpu burn tests -all looks good.
there is some connections about connect something via USB - say, some times i got X crash few seconds after i connect Sansa Clip + or iphone SE to computer USB port, to charge them.
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation C220 Series Chipset Family H81 Express LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750 Ti] (rev a2)
01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
Linux draco 4.4.38 #2 SMP Sun Dec 11 16:18:36 CST 2016 x86_64 Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz GenuineIntel GNU/Linux
Memory: Total Used Free Buffers
RAM: 16345920 12259452 4086468 3610452
Swap: 19471956 36 19471920
Bootup: Mon Feb 27 08:43:36 2017 Load average: 0.24 0.20 0.20 2/537 22108
user : 17:17:11.83 2.8% page in : 8310920
nice : 1w 02:40:34.36 28.1% page out: 45652817
system: 04:33:19.59 0.7% page act: 2490821
IOwait: 00:43:29.94 0.1% page dea: 1172764
hw irq: 00:00:00.00 0.0% page flt: 623988336
sw irq: 00:00:29.55 0.0% swap in : 0
idle : 2w 3d 06:35:57.72 68.2% swap out: 9
uptime: 3d 04:03:45.80 context : 2124572987
irq 0: 34 2-edge timer irq 18: 0 18-fasteoi i801_s
irq 1: 271 1-edge i8042 irq 23: 29 23-fasteoi ehci_h
irq 7: 23 7-edge irq 24: 0 0-edge dmar0
irq 8: 4 8-edge rtc0 irq 26: 4077564 512000-edge 0000:
irq 9: 0 9-fasteoi acpi irq 27: 4171123 1572864-edge eth0
irq 14: 0 14-edge pata_lega irq 28: 822766 327680-edge xhci_
irq 15: 0 15-edge pata_lega irq 29: 13 360448-edge mei_m
irq 16: 25 16-fasteoi ehci_h irq 30: 849 442368-edge snd_h
irq 17: 831 17-fasteoi snd_hd irq 31: 24965 524288-edge nvidi
sda 123675r 258320w md2 219r 14w
sdc 26369r 740728w md1 1226401r 1419645w
sdb 903161r 740746w sdd 150r 16w
eth0 TX 326.17MiB RX 3.93GiB lo TX 18.68MiB RX 18.68MiB
i use nvidia driver NVIDIA-Linux-x86_64-375.26.run
xorg log, copied right after crash, is added to this post.
anyone have an ideas, how to stop crash x window system? it was very annoying, actually