Smoothieboard pauses printing random

Hello everybody,
I connected my MKS TFT32 V4.0 to my smoothieboard this week. Everything works quite well. My printer pauses printing when I start a print from a USB stick or SD card from my MKS TFT32.
During the unwanted short break LED 2 & 3 flash alternately wild on the smoothieboard.
Can anybody help me further?
I don’t know what the flashing means.

Thanks in advance.

Best regards
Steve

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