Holding the Gate Open

[mgb]

I can no longer hold my gate open, hoping someone might be able to tell me what I need to do to fix this?

Previously, to hold the gate open I would go through this sequence:

- open gate using remote
- start gate closing using remote
- immediately push remote button again 

Gate would then lock in position and not close until I pushed the remote again.

However when I do this sequence now the gate simply stays open for the normal set opening time and then closes.

I'm wondering how do I get back to the mode where the gate can be kept open?

Thanks

Michael