My Lock On Modern Air Combat crashes randomly but rarely during gameplay.
I'm not sure what happens.

The game just freezes although the entire system (Windows XP) is still active.

The games was bought as a Lock On Gold package with Flaming Cliffs.

The Flaming Cliffs add-on is not yet installed & no patches have been applied yet.

System specs:

AMD Athlon 64 X2 5000+ Black Edition
ECS A770M-A
XFX 8500GT Fatal1ty
Kingston 6.1GB DDR2 667
WD 250GB SATA, WD 80GB SATA, Samsung 40GB EIDE
(all 7200 RPM)
LG GSA-H55L

Windows XP Home Edition SP2
DirectX 9.0c

I'm having the same problem here
and I have just get in community help section
to find out why that happening.....

Apply the Flaming Cliffs(FC) add-on, much more stable. Do the training stuff, then patch to (the up to date) v1.12b patch level.

I advise you to do training stuff first as all Lockon (including FC) is sensitive to the version of Lockon that training tracks are played back with. You can have playback problems if you play a track on a different patch level to the patch level it was recorded on.