SD card freezes

Hi guys, im new to this Forum. I have a delta Printer hexagon v2.USB printing causes no problems, but when i try to print using a sd card the printer frezes completely.

• the display freezes and doesn't react to commands
• the printer stops all movement and all communication though it still appears connected
• if i disconnect the printer doesn't reconnect again

It doesn't matter which SD card i use or whats on it. I've flashed the printer with the newest firmware (Repetier-Firmware for Arduino based RepRaps) and I changed the sd card detection pin component with a new. But i still got the same problems.
Any ideas what i could try next?