Yes, I've had some skidding problems on the take-off for my axel some time ago, when I'd just had my skates sharpened the week before.
My home rink usually has soft ice, and in the dog days of summer, the rink turns into a lake! So, I get used to practicing footwork, and solid landings on the soft ice, then go to the rink I normaly compete at, and can't hold an edge without wobbling, or a landing without skidding, due to the hardness of the ice.
Does the LFO edge still slip even when you're not doing a swing roll? Or just on that particular move?
With my axel, it would only skid on my takeoff, I could hold that edge on every other move...found out I was kicking too much up, and not far enough out. So maybe, you accidentally changed your technique?