couldnt find similar problem here on forums, but i hope somebody knows what could be the cause. DVD player is Philips DVP 630-632. it works okay with dvds that i have, but today we took two dvds from rental. in general they work, but sound or picture (not obligatory at same time) is disappearing every few seconds for few seconds. and when picture is there, the brightness changes too needless to say, that makes watching impossible. i thought it might be scratched dvd. on computer it worked perfectly though, so had idea to just make a copy of it. on computer the copy worked just fine. but, alas, it had the same sound and pic problem on stand-alone dvd player ( i cant imagine what exactly could be faulty. the player? or some dvds are just in some wierd format? thanks for any idea or advice.