close to Helis makes me crash?

[bond4141 0]

Hello, today i went on a server using DayZ commander, that launches through steam, and played for a good few hours with some guys. Finally, we secured a Helicopter, and as they landed it in a field and i ran towards it, my game crashed. i re-loaded Dayz, ran towards them, Game crash. I repeated this a few more times before i restarted my computer. and again, getting close to the helicopter crashes my game.

Earlier today i was on a different server and came across two helicopters and my game didnt crash. although they were not flying, and were attack copters, not the transport copter we found. And yesterday i was inside an attack chopper with no problems on a different server.

so, here's information about my stuff from DayZ commander.

Arma 2 version 102591

DayZ version 1.7.5.1

to my knowing the server is not using any other mods to add onto Dayz.

Anyways, thanks for any help given!