Things to check...
1. Ignition feeds are correct way round, as stalk adapter will rely on this to program itself
2. Check all wiring/plugs to adapter are tight and secure
3. Check no wires have been pulled taught - Clios generally dont have much space so best pulling cables down glovebox side before sending stereo back, if stereo has been pushed with wires behind it may have pulled connectors to adapter.
4. There will also be a factory reset on stereo system settings, try disconnecting adapter, reset stereo to factory, then plug controls in again.
I never really encountered problems with connects2 when fitting for my last job. Mainly problems syncing autoleads stuff.
What connects2 adapter are you using as there are 2 different types for clio, think the right one for 1*2 is something like CTSRN003, and a CTPIONEERLEAD