I have just fixed this, survived two titan map changes without crashing!!!!
The issue is a memory issue *duh* that you can fix by patching your .exe files, works for STAKER, BF2142, and Supreme Commander!
Get the files at:
3GB_enabler2.zip - FileFront.com
In the .zip is a directory called 3Gb Enabler.
All you need to do is:
1.) Take a backup of your .exe file (BF2142.exe)
2.) Copy BF2142.exe into the 3Gb Enabler Folder
3.) Open a command prompt in the 3Gb Enabler Folder
4.) Run "editbin /LARGEADDRESSAWARE <name>.exe" e.g. editbin /LARGEADDRESSAWARE BF2142.exe
5.) Copy the now patched .exe back into the game directory
6.) Start pwning on Titan maps again!
You must have >2Gb of total (physical plus page file) memory available for this to work
For 32bit Vista users, you also need to run the following to change you OS memory limit.
BCDEDIT /set increaseuserva 2900