Buffering is usually a bandwidth or Wi-Fi issue, not the app alone. For ErsatzTV streaming:
- HD: aim for ~15 Mbps stable
- 4K: aim for ~30 Mbps or higher
- Prefer ethernet or strong 5 GHz Wi-Fi near the TV
Close bandwidth-heavy downloads while watching live sports. If streams still stutter, restart the player and test another channel quality profile.