I have several new sets of warm white C6 50 light sets outlining my windows and doors. Just basic sets from a big box store. They've been in use less than two weeks. The last ten or so bulbs at the end of one set is suddenly illuminating multicolor. Any thoughts on what would cause this or how to correct it? These were not sold as color changing and have no RGB controller. Just a male and female plug on the ends. Thanks.