Well apparently the reason Nico was able to fix it straight away was because he had encountered that same issue before so he knew what to do, whereas Lewis hadn't which is why it took so long. Even when Lewis managed to resolve the issue, it seemed to revert back after a lap or two anyway.
Anyway, I think these radio messages ban are ridiculous and, a driver should be able to ask questions at least. Hopefully they'll fine tune that radio ban for things like this over the coming races.