Try disabling the merged campaign. This mod adds traffic to the rest of the world but unless you're in the Far East there are little benefits and it puts extra stress on your computer. What year are you playing in-game?
There are two possible reasons for a CTD in the Channel I can think of:
- Normandy landings
- Hitting a mine
Normandy landings overfaces most computers and hitting a mine can lead to CTD rather than the 'you're dead' screen.