Apple Fitness +

I have a problem. I have been a subscriber to Apple Fitness+ for several months now and I use it every day. I mainly use it on my tv with Apple TV. However, for the past few weeks, many of my videos are not working (error) or halfway through my workout, the video suddenly stops playing and I have to restart everything. I changed to a better internet and restarted my apple tv. Everything is updated regularly, I don't understand the problem. Has this ever happened to you? Do you know who I should contact to help me? Thank you