I had a shotgun equipped, played a level, then logged off. Logging back on later, and weapon slot is empty. This also happened once where I had 2 grav-guns, and when I loaded a level, only 1 was equipped. When I got back to the lobby, one of slots was empty.

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System Information
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      Time of this report: 4/29/2017, 22:03:39
             Machine name: GULLEY-PC
               Machine Id: {65151B28-A07F-4395-928C-827CBAFD5287}
         Operating System: Windows 10 Pro 64-bit (10.0, Build 15063) (15063.rs2_release.170317-1834)
                 Language: English (Regional Setting: English)
      System Manufacturer: MSI
             System Model: MS-7821
                     BIOS: BIOS Date: 12/02/13 10:58:36 Ver: 04.06.05
                Processor: Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz (4 CPUs), ~3.4GHz
                   Memory: 16384MB RAM
      Available OS Memory: 16328MB RAM
                Page File: 10327MB used, 8432MB available
              Windows Dir: C:\WINDOWS
          DirectX Version: DirectX 12
      DX Setup Parameters: Not found
         User DPI Setting: Using System DPI
       System DPI Setting: 96 DPI (100 percent)
          DWM DPI Scaling: Disabled
                 Miracast: Not Available
Microsoft Graphics Hybrid: Not Supported
           DxDiag Version: 10.00.15063.0000 64bit Unicode

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Display Devices
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          Card name: NVIDIA GeForce GTX 780
       Manufacturer: NVIDIA
          Chip type: GeForce GTX 780
           DAC type: Integrated RAMDAC
        Device Type: Full Device