Game crashes after about 7-12 minutes of play

I built my very first Unity game using Unity 4.3 and its 2D features. When creating a build of the game it seems a 64 bit build always crashes (the game simply closes with Windows message saying Game.exe has stopped working) after a certain period of playing the game. This happens on both windows and linux, I haven’t tested it on mac. However, the game seems to work fine continuously on a 32 bit version and whilst debugging in Unity. Does anyone know why this may be the case and if there is a solution to this problem?

This is how my windows event logs look after the game crashes:

Fault bucket 85906700254, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: GSS2.exe
P3: 52a8d945
P4: GSS2.exe
P6: 52a8d945
P7: c0000005
P8: 00000000003fa184

Attached files:

These files may be available here:

Analysis symbol: 
Rechecking for solution: 0
Report Id: 0f55d21e-9cf5-11e3-bf0d-f46d0412ebde
Report Status: 0
Hashed bucket: 2f21de34ebe1ea1257d119fc4445222c

This is the technical support forum: