Yeah either that indeed
No but wait... it's not a tv capture card issue because this happens even when not capturing, as i said the midnight freeze is very noticiable, even the mouse cursor freezes and if there is any sound playing, it will freeze too for one second at 00:00. Not too sure about the one hour freezes tough since it's most noticeable in the tv captures because of the dropped frames indicator but i think i also noticed a very small freeze in any audio that is playing at the time that small freeze happens.
I guess no one has idea to what the heck is this, right ? I almost knew this would happen, because i really tried everything it was possible to diagnose this (including extensive process monitor activity) and absolutly nothing worked. I even tried without the sound card enabled in the bios (which is a onboard one) and this still happens.