We had 9 recessed lights in the kitchen ceiling, all controlled by one switch. In a recent remodel (two months ago), we had the electrician separate out four of the lights onto a new switch. Over the last few days, when we switch on these four lights with the new switch, one of the four lights goes out after about a couple of hours. We have turned off the switch whenever that has happened. But when we turn on the switch the next day, all four lights come on, and then this one light again goes out after a couple of hours. What could be the likely cause? I am worried that there is a loose connection somewhere that is arcing or otherwise generating heat and causing a disconnection. Any suggestions as to what to do would be most appreciated. thank you