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TLC5916: garbage character after 2-3 hour of perfect operation

Part Number: TLC5916

Hi, I am using 10 Tlc5916 Ic in my project and created a led  digit display using LED arranged in seven segment sort of pattern. when i serially send data to all my IC I got correct output .

but If I left the device as it is for 2-2 and half hours automatically the data change itself with out giving any clk or data from mcu, If I keep updating data in it continuously it work fine.

but if i wait for 2 hour it automatically change the data. please help