Loose wire - is there an open wire on the Wii Classic controller; is it loose or disjointed in any way from where it meets the Classic Controller and/or the connector to the Wii Mote.
Loose Connector - is the connector unable to snap properly; is the connector itself able to connect to the Wii Mote properly in any way.
Sticky Buttons (the Wii Menu) - Is your Wii (house button) home button stuck; does it feel already pressed when you are pressing it down; is it the same for the Wii Mote's home button.
What it sounds like to me is you need another Classic Controller. $15 - $20 if I am not mistaken at Gamestop/EB Games if your in America. Don't know how much it costs elsewhere. --- Recently Finished Game: Tales of Graces f - Lineage and Legacy (PS3) Curren Game: Xenoblade Chronicles (3/4 DONE!) (Wii), Valkyria Chonicles (PS3)