Our cat went AWOL while we were on holiday (neighbour came in daily to feed him). Luckily he was found (nearly a mile away) by a family who had seen him loitering in their front garden. After 3 days they checked his collar, saw his tag and phoned us.
We think he's having trouble getting back in with the (microchip) cat flap and that's why he wandered off.
Its a good brand cat flap, only couple of months old and seems to be working fine. Our cat seems to now be pawing at it instead of going in head first (which triggers the release). He used it fine for 2 months.
We're going away again and am worried he won't be able to get in. He's a very outdoorsy cat and is miserable if we try to keep him inside.
If we take the batteries out of the cat flap its open to any cat and easier for him to get in. But so can any cat!
Just don't know what to do - he was so happy to be home and we were so worried about him. :(