hi im robin a retired techy and i recently bought this device,it lasted six weeks then started to auto fire.after looking at the motherboard i found what looked like juice on it.i cleaned this up with some alcohol and a toothbrush and tried again,still no joy so took another look this time at the 510 atty.it is then that i noticed a brown sticky substance in and around the inside.it turned out to be a lot of flux witch came from the manufacturer using old lead type solder.after a lot of cleaning the unit is now working again so if you come across this problem at least you can try this first before binning it.