It's inside the app's playback or player settings, usually labeled buffer size or cache size, and it ships on an automatic setting. Automatic sounds safer, but it tends to hold more of the stream in reserve than most connections need, which adds delay before playback starts and can make ordinary network blips look worse than they are. Switching it to manual and picking a lower value is one of the two changes that helps across most buffering complaints, alongside a faster DNS resolver, and it's the first thing worth checking before touching anything on the network side.

App updates sometimes reset custom settings back to default, including the buffer value you'd already fixed. If buffering started right after IPTV Smarters Pro updated itself, that's the first thing to check, not your Wi-Fi. Reopen the buffer setting and confirm it's still manual and still at the value you set, because an update silently reverting it is a distinct, recurring cause separate from anything on the network side, and it's easy to miss since nothing else about your setup actually changed that day. Make a habit of checking it after every update, since the app doesn't warn you when it happens.

Clearing the app's cache removes stored data that can get corrupted after an update, without touching your login or channel list. Try that before a full reinstall, since reinstalling means re-entering your credentials and rebuilding any custom favorites, which is a real hassle if you've spent time organizing them. Cache clearing is in the device's app settings, not inside IPTV Smarters Pro itself, and it takes under a minute, which makes it worth trying before anything more disruptive. If buffering clears up right after, you've confirmed corrupted cache data was the actual cause all along.