Philo's video quality adjusts based on your available bandwidth, i.e. download speed:

13 Mbps – Recommended for reliable HD streaming, even with multiple streams or other devices using the same network.

7 Mbps – Stream one HD video. If multiple devices are streaming or using the network at the same time, there may be buffering issues.

3 Mbps  – Stream SD quality video.

Under 3 Mbps – Video quality is reduced. Philo may load slowly or rebuffer.

Watching multiple videos or using the internet for other activities requires additional bandwidth. If you're trying to improve the stream quality, reduce your other streaming activities, e.g. music or gaming, to free up more bandwidth.