Powering Pixhawk

Hello,

My pixhawk is being very temperamental.  I am powering it from a 5.4V supply from my PDB and connecting that through the servo rail.  However, sometimes this works and some times it doesn't (I suspect it depends wildly on my battery voltage).  What can I do about this? 

I am using a PDB which has an advertised 5V rail, but it really comes out to be 5.4V.  I suspect my only option was using a voltage regulator.  The quad arms fine when I have it plugged into my computer. 

Any information/tips would be appreciated. 

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