Why does IPTV quality change from HD to SD by itself?

Automatic quality drops occur when the provider uses adaptive bitrate streaming (ABR) and detects temporary bandwidth drops, CDN congestion, or device limitations. If your internet fluctuates, the stream automatically reduces resolution to prevent buffering. Use Ethernet instead of WiFi, disable power-saving modes, or choose providers with stable multi-CDN routing. Glanfy recommends premium IPTV networks that maintain consistent HD quality even under load.