Yeah, the easy fix to that is to keep a diplomat or ambassador in the regions belonging to realms who share the treaty, then when the friction makes the treaty disappear, just redraft and resubmit.
That's pretty silly. If you could "...keep a diplomat or ambassador in the regions belonging to realms who share the treaty..." then you would have a diplomat or ambassador available to deal with the treaty friction, thus avoiding the problem with it failing and needing to be redrafted. Not to mention that this would completely occupy an entire noble just to sit there in case a treaty fails, which would certainly occupy *more* time than it would take to just do treaty maintenance.
The proper way to do it would be to double all your treaties. Only sign one of them, so the other is ready to be signed as soon as, or just before, the first one expires.
Of course that's an exploit, and it will almost certainly be closed before the treaty system actually goes into effect.
Also, there are several treaties you simply don't want to fail. Such as military alliances and defense pacts. Having those fail in the middle of a war could be disastrous.
