I think you need a new electrician !!! Any electrician who knows their stuff doesn't need to 'wait for the problem to occur' in order to have a clue what the problem is ... Being this is a new home I suggest whoever did the installation find and fix the problem at no charge with threats of the Better Business Bureau, etc if they hum hah around about it !!!
I asked my husband the electronics whiz your question and this is his answer:
If it is a new construction house, the pre-wiring for cable may have been improperly installed but not actually tested until you had the cable service hooked up. That is, if the cable and electrical wires were installed running together in your bedroom, and a nail or staple or other problem inadvertantly connected a conductor in the electrical cable with a conductor in the TV cable (especially the grounded shield), it could have been OK until the cable company connected their service. This is similar to the possible reason in the first responder's post.
Hope this helps.
Susan in Omaha
My first guess would be you have more than your bedroom on that breaker and the cable box is drawing just enough to make the breaker trip when something else turns on,especially a motor such as a furnce blower. Try turning off the breaker and see what else doesn't work besides the bedroom. Otherwise it has to somehow be connected to the installation. Did the installer add straps and drive a nail or screw into a wire causing an occasional short.
Add your voice to the conversation. Click here to answer this question.