history: I have a card table that I put my computer on.  My son keeps putting his foot on it and I have to constantly tell him to take it down. I have a table that is somewhat unsteady_comma_ I put my computer on there because I have no where else to put it. 
current: Have you figured out what's the problem?
next: I have not, it seems to do ok except when my son puts his foot on there even though I tell him repeatedly not to do that!