Liteon DDa110 DVD recoder appx

Question

Liteon DDa110 DVD recoder appx 18 months old worked perfectly until recently.Now will not read old or brand new discs except those commercially prerecorded.Constantlystays''reading disc'' for hours,have tried switching off/on no good.This may be coincidental but I have heard what sounds like a fan coming from unit for a few minutes & then goes off.Trouble seems to have started since then