Does this also happen with other DVDs? It may be how the disc was encoded, or how the player deals with that encoding.
While watching a foreign language DVD, we noticed that BDP-1590 would get "stuck" occasionally and repeat the same text over and over ("Light the Lantern at the 4th house!") We turned the player off then back on again, and the problem went away, only to return 10-15 minutes later in the movie (and again later on). Has this occurred for anyone else? Any known fix?