We are sorry to hear that you are experiencing difficulties when trying to play the videos with Domestika's app. This type of problem is usually due to the speed of your connection, so we recommend that you check it and try to access the app through a Wi-Fi network. We also encourage you to update the app the the latest version as sometimes older versions can also cause this error.
If you are unable to do so or if the problem continues, please remember that you can download the videos to watch them offline. To do so, you must have a good Wi-Fi connection to ensure a correct download.
If you have any other queries, we will leave you this link so that you can get in contact with us.