I am a newbie so please be patient with me. I purchased a Lukas LK 7900 ACE from green sum because you guys all spoke well of it and the seller. I received quick delivery. I went to set it up and everything was in Korean including the viewer so I knew I could change to English but couldn't find out how. I emailed green sum and they told me to download English version of viewer which I did and the guidance lady also then started speaking to me in English. I installed on Friday and took it for a two hour drive. I forgot to mention I installed a San Disk Ultra SDXC 64Gb Card. I have today removed the card to check my videos to make sure picture is okay and position of camera is aligned properly. I discovered that it has recorded two videos at the start of two hour journey and then nothing till after I arrived and went out again. It then recorded four more over two days. The GPS did not find anything until today which also seems odd even in Australia! Can anyone tell me what would cause it to shut down whilst mobile at the beginning of the two hour trip please or do I have to go back to green sum again?