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As a former licensed electrician I can tell you how how to fix it right.
Call a licensed electrician to review the problem and repair it for you. If you are truly the first owner of the house, and this was original, make sure NOT to call the same guy back(unless you have a home warranty, and ask them for someone else)
Additionally, I would give him an extra $25-50 to do a complete go through of the house. Taking out outlets to verify wiring.

In the 10years I wired and ran crews it was amazing the stuff we were called to repair for other contractors. The big thing here was to wire everything possible with the min wire (at that time 14G). We refused to do that and did lose our fair share of work for doing what we knew was right. I have been back on the side to several of those "other" houses just to replace wiring that has gone bad, or done dangerously wrong.

We lost a family friend and his daughter to a house fire...caused by a back wired outlet that overheated.