i have cox cable with a SA 2100 box, for 2 years i had it connected vcr first then cable box and then tv. for some reason now when i put the cable box on channel 3 and push the vcr/tv button on the vcr remote it wont switch to the vcr, the picture on the tv freezes. i have a second tv and vcr in another room and it started doing the same thing. as a result i cant record and watch different channels anymore. does anyone know what happened and how i can fix this? my tv only has one coaxil input and no rca inputs.