This powering down has just started happening to our avtex. We have had it since nov. 13 without problems, same sockets, same plug. it's just now started powering down when battery level falls from full, 13. 7-13. 8volts to something below 13. 4-5v. if it is the van wiring it would have done this from the start. mystery, have emaled avtex but just setting off for 3 weeks wildcamping in Denmark so not well chuffed. we are getting less than 60 mins viewing before it powers down. even when the sun is shinning and solar panels putting loads into the 2 leusure batteries wired in parallel.