Default [Q] [ask] why my leo always restart after benchmark?

hello everyone...

i have htc hd 2 t mobile version and after trying benchmark with antutu (official from PS ) when it's benchmark graphich suddennly my htc was restart?
and after restart i get score +- 3425..hmm it was bad or?

sorry for my english..
can anyone explaind what i had today?

thx a lot

update:
1. HTC HD 2 Tmo with custom room nexushd2 versi 4.2.2 nand flash..
2. Micro sd toshiba 8 GB class 4
3. ALmost apps moved to sdcard with link2sd..