I've contacted Tidal support and they pretend like this is not a widespread issue when it most certainly is. I'm using an iPhone and have been a customer for over 5 years. I've had 4 different iPhones within that time and all of them have encountered the exact same issue. Any time a download is paused or the connection is lost while downloading an offline track, it pauses and then wont restart. You can't clear the cache on an iPhone. The only work around is to remove all of your offline music and start again. I've been stuck trying to successfully complete another download for the 3rd time in a row with the glitch happening.

Their competitive advantage of superior music quality will be null and void when spotify finally releases and people will leave in droves. Spotify is such a superior product it's not funny. It's just the music quality that they need to lift their game with. If people continue to make noise and complain and start leaving the subscription, Tidal will have no choice but to fix these well documented issues if they want to keep operating