I had a similar problem with an Esoteric DV 60. I was advised to get some Teflon based lubricant, and I lubricated every moving part that seemed would benefit from the treatment. That was about three years or so ago now, and I haven't had a single problem since.
Hope it works for you as it did for me.
Regards,
Dan
Hope it works for you as it did for me.
Regards,
Dan