How to improve simulation and preventing crashdown simulation ?

Hi, 
I am using a Transport Delay component in my design.
While I am running simulation in Simulink, an error occurs and Simulink crashed down ?
I using 4 components Transport Delay with Time delay=2e-6, and 1e-3.
It happened after 2.5 secound after simulation start.

I did not change any parameters below:

_* _Initial buffer size
*Define the initial memory allocation for the number of input points to store.*_

* _Settings
Default: 1024_*

If the number of input points exceeds the initial buffer size, the block allocates additional memory.
After simulation ends, a message shows the total buffer size needed.
Tips
Because allocating memory slows down simulation, choose this value carefully if simulation speed is an issue.
For long time delays, this block can use a large amount of memory, particularly for dimensionalized input._*

Is there a way to solve it and prevent Simulink from crashing down ?

Thanks, Henry.