ARDUINO 2560 R3 BOTTLENECK

Finaly i have succeed to send 3 axis data from the SimTools to my arduino board . Everything works ok but after 3 minutes of game my arduino board stuck and it cant receive any data, i must reset by board and restart game after this. I am using @eaorobbie code
. The game that i use is Wings Of Prey . My USB , Sim tools and arduino speed is 9600 20ms. Also i place a variable at Main loop and it stuck when i=3545 every time.... What is going wrong?

*i have place an LCD screen and i can watch the 3 axis data.

The old code you are using is not efficient at all , I did warn you in another post it can be unstable, hence I was given a hand to develop a lot better of a code.
V2 of the code that @aarondc helped me with is way easier to use and its way faster, you can pull out the way it handles the serial read, much better to use it. Or to fix your code you can put a check in the code to make sure the end value is between 0 - 255 if it goes higher, disregard the value and read the next.

Ok i purchase an FT232 break board and the data flow like water. Thank you mate

Ok might be another way around the issue. I use R3 cards seem to have a fair serial connection, but not the best why I dont use them to control motors.