318i auto trans potential problem?

When I accelerate whilst going up hill, my automatic 1995 318i drops into second, like it should. However, when coming down the hill on the other side, it stays in second gear. Sometimes it will find third, other times I have to come to almost complete stop and get going again. No clunking. No slipping. Car just had an Inspection II three months ago.

Anyone ever experience this?

Any advice appreciated.

David

Dunedin, New Zealand