OK I'm back from a nice 340km drive through outback Western Australia and Dennistdk you'll be glad to know I have replicated the issue (I never doubted you). First up was the Oppo cable. The first 80km were uneventful, even though I was in and out of range and only getting 1 bar when in range. I didn't understand why.... maybe it was the iPhone case (spigen slim armor), removed this and was OK for a little while, then some strange noise and a restart. 20km down the road, 3 restarts in 1 minute. I was mostly on 1 bar 4g (LTE). Happened 1 more time after that. I then turned off 4G so could only use the 3G (850 band) and a few times I heard some mobile related interference but no restarts. Got to where I was going, swapped the oppo cable for a tired old standard apple cable and redid the same journey back. On 3G I had the occasional bit of noise, switched 4G back on and only the occasional bit of noise as well. The section of road where it dropped out 3 times quickly now only had some mobile noise once and there were no drop outs at all with the apple cable. So the noise for me only comes out of the right speaker, it is a very low volume and with music on was not always easy to spot, but there. It is the mobile inference sound we all know over a speaker but sounded more like hisses than beeps. When I had low reception and was dropping in and out, if I tried to browse a webpage or use an app that required web access the interference noise would go on for longer than when it restarts and it sounds each time you try and access something, but each time I did this it never dropped out. Final tally was 5 drops outs with the Oppo cable and none with the apple cable. Noise was heard on both. Funnily when I had the slim case on my phone, which I always do, there were no issues at all with either cable. I have contacted the Australian supplier for Oppo and they have told me me they can pass on the feedback to the Oppo engineers. I have also linked this thread so lets see what comes of this, never hurts to have more reports. In any case for me this DAC is outstanding sound wise for the price and I am very happy with it. Yes it has a couple bugs, which I sure hope get addressed, but for now I am hanging on to it as it doesn't effect me the way I use it. I know this isn't the case for everyone so be aware of your needs before you purchase.