I have a MX7000, purchased in 2000. It has been working fine but i realised that, lately, the picture tends to flicker and become distorted at times after watching for some time (warmup). The programs used to go through the antenna input but became loose after all these years so i have switched to RCA to scart input. It was fine all these while till lately the above problem arises.

Anyone can advise on the cause of problem and remedies?