As far as i know, you shouldn't worry about this warnings. I doubt its the problem.
WARNING: UNABLE TO MAP GAME PRESENTATION CODE: prsnt_game_start
WARNING: UNABLE TO MAP GAME PRESENTATION CODE: prsnt_game_escape
WARNING: UNABLE TO MAP GAME SCRIPT CODE: game_check_party_sees_party
WARNING: UNABLE TO MAP GAME SCRIPT CODE: game_get_party_speed_multiplier
And the vertex buffer memory seems to expand just fine, without giving error
Out of Static vertex buffer memory. Needed = 203710 Available: 200000
Expanding Buffer Capacity to 254637
Out of dynamic vertex buffer memory. Needed = 30739 Available: 24000
Expanding Buffer Capacity to 38423
So im stumped

It might have to do something with your video card, i am not sure. Maybe Gerhart or PrinceGhaldir have an idea whats going on.
Edit: Might be overheating issue, but since its only ctd and the whole system keeps running, it's very unlikely to. Although still a possibility.