I have the i river H320 & am very pleased with it, however I want to do line in recordings from radio overnight & edit afterwards. The problem I have is it stops at 300 mins (it's how it puts it) which is 5 hours. I need it to run for 8 hours, this is with & without the mains adapter. I can't find any way of altering it. I was under the impression it would record until the battery ran out, very much more than 5 hours. Can anyone help?