I believe that it is a technical issue with smartboard....I was reading where some similar issues were being caused through the wireless adapter not signalling all the functions... and that it needed to have the battery changed and also disconnected and then reconnected...but since you are hardwired then that doesn't fit.

Anyway since it happens only when connected to the smartboard then I would say the problem lies with them.

You need to know exactly what make and model of smartboard it is and will probably have to depend on emails sollutions as they can only be contacted that way.

Good luck!