rebooting nightmare.

Rebooting nightmare. My 840(24.19 v) does a series of random bootups when I first start the device just before my ride. Does anyone have a fix for this? I’m usually booting it after taken off rack then put on shoes/helmet/etc…noticed it’s turn back off. A couple times after hitting the boot up button, the device finally stabilizes on running. I usually do the full power off after each ride. Any help would be greatly appreciated. 

cheers,

Mike