[LAD] LV2 GUI - GTK widget signal disconnect

Hello, I have a strange issue in my plugins GUI beatslash-lv2 (https://github.com/blablack/beatslash-lv2) or deteriorate-lv2 (https://github.com/blablack/deteriorate-lv2). The GUI widgets to control the plugins gets disconnected when used for a while. I can reproduce the issue in Ingen almost everytime, although I never know exact when the GUI will disconnect and Ingen doesn't output any error. What happens is that once the widgets disconnect, if I try to change the values via the GUI (turn the dial, change the value of a combo box, etc) the changes are not transferred to the LV2 DSP. The way I connect the GUI values to the LV2 values is as follows: m_comboWaveForm->signal_changed().connect(compose(bind<0> (mem_fun(*this, &Vco2GUI::write_control), p_waveForm), mem_fun(*m_comboWaveForm, &ComboBoxText::get_active_row_number))); where m_comboWaveForm is of type Gtk::ComboBoxText* Even if I close the GUI and reopen it, the signals won't reconnect. I'm not sure where the issues is (GTK, LVTK.....or my code!). Is there a better way to connect signals in such design? Thanks in advance for the help. Aurélien