Guide
Waka TV Not Working: 7 Fixes That Work
Fix Waka TV when it will not open, will not play, or keeps stopping: seven fixes in the order worth trying them.

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Start With the Cheap Fixes
Waka TV download problems usually have boring causes, and the boring causes have cheap fixes. Start with the connection: switch between Wi-Fi and mobile data and see if the problem follows the connection or the app. A problem that follows the connection is a network problem, not an app problem.
Next, force stop the app and open it again. This clears a stuck session without touching any saved data, and it fixes more playback failures than any other single step. Restart the phone only after that, since a restart clears deeper stuck states that a force stop cannot reach.
Clear the app cache as the third step. Cache clearing removes temporary files while keeping the app itself intact, and it fixes titles that load halfway and then freeze. Only reinstall after these three steps, because reinstalling first wastes time and data.
When the Cheap Fixes Fail
Check storage next. A phone with almost no free space cannot buffer a stream properly, and the symptom looks exactly like a network failure. Free a few hundred megabytes and test again before blaming the catalogue.
Check the install source too. An app installed from a half downloaded file behaves strangely in ways that look like bugs. Reinstall from a complete file on a stable connection, and keep the install permission for the installing app only.
Finally, test a different title in the same category. One dead title is a stream problem. Every title dead is an app or connection problem, and that distinction decides the next fix. See also the buffering fixes.
Conclusion
Work in order: connection, force stop, cache, storage, then reinstall. Most Waka TV failures give up by step three, and the order stops a small problem becoming a long evening.