I do. On long pieces I always do but I must admit if I chain piece I tend to forget. With this new machine it has a fix button few stitches in one place and I use it far more. Like yourself I have found seams coming undone . I do like paper piecing and I hand stitch and always double stitch when working by hand. I think I must follow the same practise.
Will be interesting hearing from the very experienced quilters.