Right shift key stops working until I restart Karabiner-Elements

[stuartisaac]

Karabiner-Elements has been working great for me for years until recently, when I started having issues with my right shift key (on a Microsoft Sculpt ergonomic keyboard), where shift would not be recognized, so I couldn't capitalize properly. I assumed that the keyboard had failed, and got an Incase replacement, but then it started happening with that one as well, which was awfully suspicious. It was at that point that I tried restarting Karabiner-Elements when that key would stop working, and sure enough, that would solve the issue for some (usually pretty short) period, and the cycle continues.

I'm on macOS Tahoe (26.2) on an M3 Pro MacBook Pro, Karabiner-Elements version 15.9.0.

Here's some key logging with the event viewer, showing a couple of mouse events, then me pressing right_shift+a, without right_shift being recognized, then the successful left_shift+a.

[
  {
    "type": "down",
    "name": {"pointing_button":"button1"},
    "usagePage": "    9 (0x0009)",
    "usage": "    1 (0x0001)",
    "misc": ""
  },
  {
    "type": "up",
    "name": {"pointing_button":"button1"},
    "usagePage": "    9 (0x0009)",
    "usage": "    1 (0x0001)",
    "misc": ""
  },
  {
    "type": "down",
    "name": {"key_code":"a"},
    "usagePage": "    7 (0x0007)",
    "usage": "    4 (0x0004)",
    "misc": ""
  },
  {
    "type": "up",
    "name": {"key_code":"a"},
    "usagePage": "    7 (0x0007)",
    "usage": "    4 (0x0004)",
    "misc": ""
  },
  {
    "type": "down",
    "name": {"key_code":"left_shift"},
    "usagePage": "    7 (0x0007)",
    "usage": "  225 (0x00e1)",
    "misc": "flags left_shift"
  },
  {
    "type": "down",
    "name": {"key_code":"a"},
    "usagePage": "    7 (0x0007)",
    "usage": "    4 (0x0004)",
    "misc": "flags left_shift"
  },
  {
    "type": "up",
    "name": {"key_code":"a"},
    "usagePage": "    7 (0x0007)",
    "usage": "    4 (0x0004)",
    "misc": "flags left_shift"
  },
  {
    "type": "up",
    "name": {"key_code":"left_shift"},
    "usagePage": "    7 (0x0007)",
    "usage": "  225 (0x00e1)",
    "misc": ""
  }
]

[rbvermaa]

Having the same issue with a Microsoft Natural Ergonomic 4000 keyboard, since two weeks or so.

• Tahoe 26.3
• Karabiner Elements 5.9.0