I was in the TO run yesterday when the EMS blanked and entered a start up sequence.

The EFIS was fine and I don't believe there were any electrical power fluctuations. I have back up batteries fitted to both the EFIS and the EMS. After it rebooted it was fine for the flight of about 59 minutes. Software version : 7.4.0-MV15 , no mapping.

Any thoughts to the cause or if it is likely to happen again?

Thanks.