failed to create vertex

hi i need help. exusmi i no good speak english

i create a application 2d with unity and export platform windows 32bit i run and use component linerender and dynamic setcount vertex until maximume 1000 vertex and change count in half second , create gameobject runtime and distroy after half second.

when after 2 or 3 hours run my app2d crash my app and this error: D3D9 : failed to create vertex buffer size of 128[ out of memory] D3D9 : failed to create index buffer size of 12[ out of memory]

how fixed this problem????