I have a new 3 month old battery and my PMP was working fine set to 12v for the first month of its use. After a month, it kept cutting out as if the voltage dropped under 12v. I tested several times with a multimeter and it was consistently over 12.3v while ignition was off and car parked overnight. I've had to set it to 11.8v so it doesn't shut off randomly, all the while the multimeter confirms it's still well over 12v. I bought it from blackboxed.ca but they are ignoring my requests for an RMA, any ideas here?