My knots aren't knotting

I'm so annoyed. I stopped doing Kandi for probably half a year and now that I'm getting back into it, none of my knots will stay. I'll triple and quadruple knot them and they'll still manage to come undone. My singles are coming undone and I really don't understand why. I haven't had this issue ever and all of my older bracelets and creations are perfectly fine and stable. I'm doing it the exact same way I always have and I, for the life of me, don't know what the problem is.