It looks like your board supply voltage drops as low as 4.55v at some points. It's likely that your board is browning out. The voltage tolerance for the board is 5 +/- 0.25v so anything below 4.75 is not good.
Thanks for your reply.If the board was browning out,there must be a "failsafe" reponse.I analysed the log file,I have n't found "failsafe".
Thank you.I will change the way for the power supply.