I had issues with LBW towards the end of last season. I've been working on the bowling machine on my front foot movement.
After each shot, I turn and look to see where my front foot is in relation to the stumps. A lot of the time during my troubles it had crept all the way over to off stump and even beyond, making anything straight quite difficult to play around my pad as well as making me an easy LBW victim.
This autumn/winter I've been trying to ensure my front foot never gets any further across than middle, and in most cases, leg. My bat then comes down alongside my pad, and the bat is in line with the stumps instead of the pad.
I lose some effectiveness when driving wider deliveries and I can leave a gap between bat and pad sometimes when 'chasing' the wider ones outside off, but as the drive is IMO the best part of my game, I'm backing myself to be able to put these away.
In addition I've opened my stance out a little, and I've experimented with pointing my toes on my front foot towards the non strikers end as part of my stance, before the bowler starts to deliver the ball.