Same with me, but only with certain channels. It may be the service tho.

It’s a common problem with any iptv hosting. Doubtful it’s your internet, unless your working with sub 15mbps. It’s possible to be not enough RAM on your box....but again, it’s more than likely your iptv service. Obviously the first round of protocol is to reset router and restart box ....that’s usually not the problem, but still worth doing once every 2-3 weeks. Clear cache and see if anything helps.

Probably your IPTV provider if you see it on a regular basis. You can adjust the sync on the channel while watching. Hit the OK button (if you have a shield or firetv) and then scroll over until you find the adjustment for audio sync.