[Lord of Hog]

Sounds like you've got some lazy / dying / dead actuators there. I did hear once about some lazy ones coming back to life after the battery was disconnected for a few minutes but for a permanent fix you'll probably need to replace them. On the bright side second hand ones aren't expensive and I think there's a "How To …" on here somewhere. Having done a front one I can tell you that it can be achieved without removing the glass. Don't know about the rear ones.