Resposta do OP (originalmente publicada como uma atualização da pergunta):
I finally solved the issue. It was the "Dell Product Registration" which was binding those hotkeys. I realised that using "Process Hacker", showing the column "Start time", sorting desc and starting with Windows. When the OS started, I opened my Sublime Text and pressed a hotkey until it stopped work. So I found a bunch of applications candidates to kill and after stop the mouse over Process Hacker on tray, I saw that
prodreg.exe
was consuming 0.8% of CPU. I closed it and voilá, Ctrl+N, Ctrl+O and Ctrl+P is working fine now.