Reset-Button fail/crash

Hello,

i am new, so hello everyone first!
Maybe someon can help me with my little Problem:

My Program runs fine, i press the Reset button and i got a hänging white screen!
If i dissconnect Power / or USB and connect again everything i s fine again.

Hardware:
Mega 2560 + 2.8" Adafruit Touch TFT

Software:
TFT: ILI9341_due
TOUCH: Adafruit_STMPE610

Background:
Normaly the STMPE610 and ILI9341_due dont work together but a litte workaround is
reset the setSPIClockDivider after each touch reques (50-100 times a second).

Does anyone know some reasons why the reset-button is now a crash-button?