A number of things can be causing this issue. Let's eliminate these one-by one:
1. The most common issue is that the health of your torrent is poor (most common). To check this, try downloading a Featured Content torrent. Tap on the menu button (three dots) in upper corner of the screen in portrait (vertical) mode. Tap on ‘Discover’, then within the Featured Content page, tap on a small torrent you haven't downloaded before. The only difference between these torrents and torrents you’ll find in the wild are the number of seeds (these are usually heavily seeded), therefore they are being shared a lot. If the torrent will download quickly, then the app is working fine, but you need to look for torrents with more seeds.
2. Your app is in ‘wifi-only mode’ and you are not on a wifi network. To check this, tap on the menu button (three dots) in upper corner of the screen in portrait (vertical) mode, then tap on ‘Settings’. Turn off the switch for ‘Use Wi-Fi networks only’, then toggle it once to make sure it is off. This will turn it red.
3. Your network connection is poor (common). To check this, try streaming content on your browser or an app (e.g YouTube). If you can stream content without too much buffering, then you probably have a strong connection. Alternatively, check your wifi speed with the free Speed Test app from Google Play.
4. Your wifi network connection is blocked by the ISP. This means your network is blocking torrent files, or is blocking your outgoing port. To check this, try downloading a Featured Content torrent on another network. If you can download a torrent on another network (particularly a fast wifi network), then it’s likely that your wifi network is causing the issue. To fix this, tap on Menu, then Settings, then Incoming TCP Port in our app. Look at the TCP Port number, and increment it up by one. For example, if your port number is 6881, make it 6882. If this doesn’t work, your wifi network may be throttling BitTorrent traffic, in which case we can't help with a workaround.
5. The app isn't working well with your device. To check this, delete any unfinished torrents, then close the app. Next, delete BitTorrent app data by going to your phone’s Settings, then App, then BitTorrent, then Storage, then Clear Data. Next, reboot your phone, then uninstall and reinstall the app, then reboot your phone again. Then try downloading a torrent that you haven’t downloaded before, such as a Featured Content torrent with a lot of seeds.
Note to Samsung owners. device owners are reporting crashes and download/streaming/wifi connectivity issues related to an Android 4.3 OS update. Please see: http://bit.ly/1bH59iS for more information.
6. You are not seeding, and the swarm is ignoring you. If you are not seeding, you may be anonymously identified by the swarm as a leecher. Leeching means you download, but you don’t share. Some users reporting slowdowns after using the app for a long time are having this issue due to not seeding. To check this, go to your phone’s Menu, then Settings, then Upload limit, then change this to a reasonably number (not zero). Try seeding a little, and see if your torrents start speeding up. But please don’t do this with your data plan. Use wifi-only mode, which is also under Settings.