We have a SONSO Play 3 and an iPhone 6 and a 6s. When playing music that is stored 'On this iPhone' the tracks skip half way through or playback stops altogether. The problem does not occur when playing from a different source, e.g. a streaming service or radio station. Playing music from the desktop app also works fine. SONOS firmware has been updated several times since this issue began. Similarly, iOS running on our phones has been updated several times too. Our router has also been replaced (it is a Vodafone Ultra Hub Gateway). I have assigned a static IP address for the SONOS and to our phones, but to no avail. The issue happens when playing from both phones. I have even tried keeping the phones and screens awake, but it still happens. I have read through many similar issues posted and tried various fixes but nothing works. Other that this, we have no intermittent issues with the WiFi. It is concerning that a large number of others appear to have this issue, but there doesn't seem to be any solution. This is completely preventing us using the sonos. Please advise.