It never ceases to amaze me how the IRS, DOL and industry practitioners have generally absolved the participant of any and all responsibility with respect to their contributions and retirement accounts. If I'm over age 50 and knowing/expecting/wanting to save more than $18,500 then I'm going to be damn sure my contributions continue.
Or people who elect a contribution change and don't recognize (for months or even years - not a lie) that their contribution (or take home pay) never changed - hello, McFly!
Yes, plan sponsors are responsible to properly administer their plans, but I think participants should incur some responsibility as well, especially if they have received multiple sources (pay stubs, quarterly statements, etc.) that clearly show any errors.
Sorry, just my grumpy Monday rant because the 'Cuse got toasted Saturday at Va Tech and the wrong two teams are in the Super Bowl.