Found the issue Reaper doesn’t always play nice and actually work at the sample rate it shows on the main mixing page ( I think that is just the info the driver is reporting), my colleague isn’t a great user of DAW’s so didn’t realise this, everything was at 96k but on the audio device page in reaper at the request sample rate box it was still set at 48k. Why do these things always happen when your in a hurry and miles from anyone who knows what to do 🙁 Lesson learned thankfully nothing critical and the much maligned USB recorder ran for 2hours with no problem.