Why did some key combinations stop working in Kubuntu with LXDE and how to fix it (I suspect pgAdmin)?

Question

Kubuntu

Suddenly stopped working in all programs (Firefox, leafpad, NetBeans) Ctrl+A, Ctrl+S, Ctrl+F. In this case, Ctrl+C, Ctrl+V, Ctrl+U and Ctrl+Alt+T work as usual. I decided to restart my computer and, closing PgAdmin, I got an error. Reboot didn't help, googling this error too. How to fix this problem?
OS: Kubuntu 14.04 x32, kernel 3.13.0-32
DE: LXDE
pgAdmin 1.22.1
Error:

ASSERT INFO:
../src/common/wincmn.cpp(478): assert "GetEventHandler() == this" failed in ~wxWindowBase(): any pushed event handlers must have been removed

BACKTRACE:
[1] wxWindowBase::~wxWindowBase()
[2] wxWindow::~wxWindow()
[3] wxControlBase::~wxControlBase()
[4] wxTextCtrl::~wxTextCtrl()
[5] wxWindowBase::Destroy()
[6] wxWindowBase::DestroyChildren()
[7] wxWindow::~wxWindow()
[8] wxGridWindow::~wxGridWindow()
[9] wxWindowBase::Destroy()
[10] wxWindowBase::DestroyChildren()
[11] wxWindow::~wxWindow()
[12] wxGrid::~wxGrid()
[13] wxRegionBase::~wxRegionBase()
[14] wxWindowBase::Destroy()
[15] wxWindowBase::DestroyChildren()
[16] wxWindow::~wxWindow()
[17] wxNonOwnedWindow::~wxNonOwnedWindow()
[18] wxTopLevelWindowBase::~wxTopLevelWindowBase()
[19] wxTopLevelWindowGTK::~wxTopLevelWindowGTK()
[20] wxFrameBase::~wxFrameBase()
[21] wxFrame::~wxFrame()
[22] wxRegionBase::~wxRegionBase()
[23] wxRegionBase::~wxRegionBase()
[24] wxAppConsoleBase::DeletePendingObjects()
[25] wxAppConsoleBase::ProcessIdle()
[26] wxAppBase::ProcessIdle()
[27] wxApp::DoIdle()
[28] g_main_context_dispatch
[29] g_main_loop_run
[30] gtk_main
[31] wxGUIEventLoop::DoRun()
[32] wxEventLoopBase::Run()
[33] wxAppConsoleBase::MainLoop()
[34] wxAppConsoleBase::OnRun()
[35] wxAppBase::OnRun()
[36] wxEntry(int&, wchar_t**)
[37] wxEntry(int&, char**)
[38] __libc_start_main

Fragment ~/.openbox/lxde-rc.xml

<keyboard>
  <chainQuitKey>C-g</chainQuitKey>

  <!-- Keybindings for desktop switching -->
  <keybind key="C-A-Left">
    <action name="DesktopLeft"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="C-A-Right">
    <action name="DesktopRight"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="C-A-Up">
    <action name="DesktopUp"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="C-A-Down">
    <action name="DesktopDown"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="S-A-Left">
    <action name="SendToDesktopLeft"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="S-A-Right">
    <action name="SendToDesktopRight"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="S-A-Up">
    <action name="SendToDesktopUp"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="S-A-Down">
    <action name="SendToDesktopDown"><dialog>no</dialog><wrap>no</wrap></action>
  </keybind>
  <keybind key="W-F1">
    <action name="Desktop"><desktop>1</desktop></action>
  </keybind>
  <keybind key="W-F2">
    <action name="Desktop"><desktop>2</desktop></action>
  </keybind>
  <keybind key="W-F3">
    <action name="Desktop"><desktop>3</desktop></action>
  </keybind>
  <keybind key="W-F4">
    <action name="Desktop"><desktop>4</desktop></action>
  </keybind>
  <keybind key="W-d">
    <action name="ToggleShowDesktop"/>
  </keybind>

  <keybind key="C-A-d">
    <action name="ToggleShowDesktop"/>
  </keybind>

  <!-- Keybindings for windows -->
  <keybind key="A-F4">
    <action name="Close"/>
  </keybind>
  <keybind key="A-Escape">
    <action name="Lower"/>
    <action name="FocusToBottom"/>
    <action name="Unfocus"/>
  </keybind>
  <keybind key="A-space">
    <action name="ShowMenu"><menu>client-menu</menu></action>
  </keybind>

  <!-- Keybindings for window switching -->
  <keybind key="A-Tab">
    <action name="NextWindow"/>
  </keybind>
  <keybind key="A-S-Tab">
    <action name="PreviousWindow"/>
  </keybind>
  <keybind key="C-A-Tab">
    <action name="NextWindow">
      <panels>yes</panels><desktop>yes</desktop>
    </action>
  </keybind>

  <!-- Keybindings for running applications -->
  <keybind key="W-e">
    <action name="Execute">
      <startupnotify>
        <enabled>true</enabled>
        <name>PCManFM</name>
      </startupnotify>
      <command>pcmanfm</command>
    </action>
  </keybind>

  <!--keybindings for LXPanel -->
  <keybind key="W-r">
      <action name="Execute">
        <command>lxpanelctl run</command>
      </action>
  </keybind>

  <keybind key="A-F2">
      <action name="Execute">
          <command>lxpanelctl run</command>
      </action>
  </keybind>

  <keybind key="C-Escape">
      <action name="Execute">
          <command>lxpanelctl menu</command>
      </action>
  </keybind>

  <keybind key="F11">
     <action name="ToggleFullscreen"/>
  </keybind>

  <!-- Launch Task Manager with Ctrl+Alt+Del -->
  <keybind key="A-C-Delete">
      <action name="Execute">
          <command>lxtask</command>
      </action>
  </keybind>
    <!-- Fast access to Terminal -->
    <keybind key="C-A-T">
      <action name="Execute">
        <command>lxterminal</command>
      </action>
    </keybind>

   <!-- Fast access to filemanager --> 
   <keybind key="C-A-D">
      <action name="Execute">
        <startupnotify>
          <enabled>true</enabled>
          <name>PCManFM</name>
        </startupnotify>
        <command>pcmanfm</command>
      </action>
    </keybind>

   <!-- Keybinding for PrintScreen Key -->
    <keybind key="Print">
      <action name="Execute">
       <execute>scrot</execute>
      </action>
    </keybind>

    <keybind key="A-Print">
      <action name="Execute">
       <execute>scrot -s</execute>
      </action>
    </keybind> 

    <!-- Keybinding for Volume management -->
    <keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
          <command>amixer -q sset Master 3%+</command>
      </action>
    </keybind>

    <keybind key="XF86AudioLowerVolume">
      <action name="Execute">
          <command>amixer -q sset Master 3%-</command>
      </action>
    </keybind>

    <keybind key="XF86AudioMute">
      <action name="Execute">
          <command>amixer -q sset Master toggle</command>
      </action>
    </keybind>

    <keybind key="XF86WWW">
      <action name="Execute">
          <command>x-terminal-emulator</command>
      </action>
    </keybind>

    <keybind key="XF86Calculator">
      <action name="Execute">
          <command>galculator</command>
      </action>
    </keybind>

    <keybind key="XF86MyComputer">
      <action name="Execute">
          <command>pcmanfm</command>
      </action>
    </keybind>

    <keybind key="XF86Terminal">
      <action name="Execute">
          <command>x-terminal-emulator</command>
      </action>
    </keybind>

</keyboard>

Answer 1

Already figured it out. The problem turned out to be hardware, the replacement of the keyboard helped.