rnse blinking

ch1z64

C'mon you's bhoy's in Green
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i have a problem which i am hoping that people on here can help me with.
I have a Rnse mk2 ( 32gb card 1 ) and when i switch it on it sometimes starts to blink and the screen goes off comes back again and then starts to blink a few times more b4 working perfectly , now this doesn't happen all the time when i start up just on occassions , i have had unit out off car checked all cables non loose and all connected correctly so has anyone got any suggestions cheers in advance .