Thanks for the tips. I have used beeswax and other conditioners with no avail. I can see about the recoloring of other threads. Maybe that has something to do with it. when I use the sewing machine it isn't a problem, only once or twice that I recall. Its mainly hand sewing. I am so surprised that it isn't a problem with others. I may just use a dark color that isn't black instead. I shall try that brand recommended too.
Thank you