Strange electrical issue

[Duratay]

On my 2015 sedan, 4 times now in the last 2 weeks, when I go to start it, is completely dead...but when I close the door sharply, everything starts up. I checked all the battery connections that I could and they all seem tight. Figure there must be something loose that closing the door jars back into place but have no idea how to find it. Don't know what else to check. I'm widowed and live alone in a rural area and am afraid that one of these times it won't start. Suggestions??

 

[FalconHeavy]

On my 2015 sedan, 4 times now in the last 2 weeks, when I go to start it, is completely dead...but when I close the door sharply, everything starts up. I checked all the battery connections that I could and they all seem tight. Figure there must be something loose that closing the door jars back into place but have no idea how to find it. Don't know what else to check. I'm widowed and live alone in a rural area and am afraid that one of these times it won't start. Suggestions??

I had the same issue last year. I could never track down the reason. I started not using the alarm, and it seemed to stop for some time now. I also bought a jump pack that I keep in the trunk now. Odd thing was, my other vehicle (work van) also kept going dead. It was a strange time. I would say check the fuse block and positive connection on the block on the battery. Some folks solved their issue that way.

 

[Guliscool]

Are you using a Hyundai battery or an aftermarket battery, if so the aftermarket battery shims are slightly smaller than Hyundai battery ones and that can cause loose connections.