Been enjoying watching the Chicago Fire TV series. After series 3 the subtitles just stopped. I find that about 90% of times that downloading a TV series made in the twenties, you just click on Subtitles, then a second click just below, if applicable, the subtitles come up. Once you get the subtitles at the start of a TV series, they stay right to the end, but very occasionally just stop, like in the Chicago Fire series. Watching old TV series from the fifties and sixties like Wagon Train, and The Bill from the eighties, the sound is very clear there are no Subtitles and no need for them. This is nothing to do with the actual volume, just the clarity. Anyone help?