Quite often, problems with streaming applications are related to slow internet speeds. So try using other apps like Youtube and check whether your internet speed is good enough to stream HD content on Youtube or not. If it buffers on Youtube, then the problem is with your internet connection. You can try contacting your internet service provider and enquire about any possible server or connection issues. Connect your TV to your modem via an Ethernet cable if there are no such issues. A wired connection is always more reliable and faster than a wireless one.

You can also try bringing your WiFi router closer to your TV set as an added step.

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