I have inherited this model from my parents, it wasn’t used a great deal and is not that old but I am finding it extremely sensitive to any mark or minor scratch on the DVD. My two year old has a pile of DVD’s both DVDR and originals and inevitably they get minor scratches, sticky fingermarks etc. The pictures are constantly freezing, skipping, returning to the menu screen or showing disc error. The discs play fine on other peoples machines and the marks are all fairly minor. I clean the discs with tissue and have used a dry cleaning disc (cheap one) on the machine but with little improvement, even though the manual advises against using cleaning discs. Is the machine in need of cleaning (if so what products would you recommend), is there a better way of cleaning the discs does the machine require a firmware upgrade (whatever that is). Pristine, brand new discs usually play fine but it does seem to be extremely sensitive to the smallest flaw. Any advice appreciated.