As this web site has noted previously, many lazy people (even TV newsreaders, who should know better) are omitting legitimate sounds from spoken words (e.g., “artic” for “arctic”). But the opposite also happens. More and more, I hear an intrusive “g”, butting in after an “n” where it has no business.

Examples: “increasing” pronounced “ing-creasing”; or “concrete” pronounced “cong-crete”.

These usages don’t seem to be either regional or ethnic, but simply a speaking disorder with no apparent origin.