If you have a pre-lit Christmas tree that is over 3 years old, it is now recommended that you replace your tree. Testing has been done and apparently the wires in the pre-lit trees are prone to twisting and crimping which can be a fire hazard. I saw this report on my local news last week.
Since ours is pre-lit and 5+ years old, I'm off to find a new tree. A non-pre-lit tree that is hopefully 4 ft tall. I'm over big trees. Want one that will fit on a small tabletop. Much easier to put up, take down and store.