I have a Sumvision HDMIDVD Player and it is not totally broken but.....
some films it will play fine but this is the weird thing, some things it goes weird as once i put a film in and selected play movie on menu screen and it just went back to the trailers then menu screen again.
Another one i selected play on menu screen and it started half way through film, i tried selecting a scene from select a scene menu but would not let me choose a scene before the one it starts from.
I do have a few more funny errors but the most common one is problems with menu screens and alot of times i have to start film by going to scene selection and picking scene 1 (but even this does not always work)
I said its weird because some films are totally fine with it so if any ideas out there HELP!!!!
You can try resetting it to factory settings, like it was when you took it out of the box. It usually tells you how, in the owner's manual, in the troubleshooting area. You can also contact the company themselves. They may be able to help. It may be a known problem. But, it sounds like it's time for a new player.
I've never heard of that brand before. Are you in the US?
