There definitely has to be some software issue. I've had my 75 for about a month now. When I first booted it up I couldn't sync between the amp and iPad. I just had 'no device' After spending time updating the software on the iPad and amp I still had 'no device'. I switched off all bluetooth devices nearby, sat my iPad (with bluetooth active) on top of the amp and still 'no device'. As a last resort I re-installed the original firmware (1.01 if memory serves) on my amp and lo and behold I was up and running. I had my amp active on my iPad, I experienced a few drop outs but at least I had a functioning product. Have been noodling away all afternoon. Am reluctant to upgrade the firmware on my amp again incase i'm back to 'no device'.