diff --git a/internal/playback/handler/proxy_stream.go b/internal/playback/handler/proxy_stream.go
index 50b23b6..a638fb7 100644
--- a/internal/playback/handler/proxy_stream.go
+++ b/internal/playback/handler/proxy_stream.go
@@ -47,7 +47,9 @@ func (h *PlaybackHandler) HandleProxyStream(c *gin.Context) {
 
 	copyProxyHeaders(c.Writer.Header(), resp.Header)
 	c.Status(resp.StatusCode)
-	_, _ = io.Copy(c.Writer, resp.Body)
+	if n, err := io.Copy(c.Writer, resp.Body); err != nil {
+		observability.WarnContext(c.Request.Context(), "proxy_stream_copy_failed", "playback", "", map[string]any{"target_url": targetURL, "bytes_copied": n}, err)
+	}
 }
 
 func (h *PlaybackHandler) writeProxyPlaylist(c *gin.Context, resp *http.Response, targetURL string, referer string) {