Yes I have this problem too, although I do not get picture breakup, just the momentary sound interruption. I timed this not long ago and it was regularly at 60 second intervals. I emailed both ABC Audience Support and the LG content store. Both told me to uninstall and then re-install the ABC iView app. The ABC went further and requested that I also turn the modem and TV off at the wall for a few minutes, switch back on again (to reboot both) and complete a factory reset of the TV, then relaunch the app. I did everything other than factory reset the TV, as it is not a trivial exercise to re enter changes made to the default TV and program settings. Needless to say that this did not fix the problem.
Interestingly I also noted that the currently installed version of ABC iView on my LG E8 is 4.8.3 and that the LG content store on the TV indicates that 5.4.0 is the latest version available. However when I uninstall and re-install the App, it is version 4.8.3 that downloads and installs once again. Consequently I can never get the latest version, as there may be a good possibility that our momentary sound issue interruption problem may not be manifest in 5.4.0. I have asked LG why this is the case and I have had no reply. I also know that my son has an older LG TV than mine and his has correctly updated to the new version 5.4.0. So what gives?
I would be interested to know if others have experienced the same inability to update to the latest version issue as me. It would appear that there is a bug on two fronts that LG (in conjunction with the ABC) needs to acknowledge and address promptly.