robb wrote:
Equipment:
I have genie g5050 1/2 hp screw drive opener (about 12 years old) and a
20 ft (1 piece) wooden door with 2 center mounted torsion springs and cable
drums on the outer sides.

the GD repair company installed new springs and adjusted door about 1 year
ago, door looks straight/level and lifts fairly easily about half way up it
starts to go by itself a little and stops.

Problem:
Door started kicking back up 1/2 way down about 3 weeks ago. this slowly
got worse. Then door started to stall/stop about 1/2 way up. Now door will
kick back after couple inches travel in either direction starting at any
position you set the door.

if i disengage the door from opener and turn it on the screw will turn for
about 4-5 seconds then stop. i thought it used to just keep going till you
hit the button again ???

What i tried:
1- checked and tightened all hinges,
2- move door up/down to check for binding.
3- cleaned then adjusted the safety tension on the rear of opener

appreciate any more helpful ideas

I don't see any mention of anyone ever having lubricated the screw with
the special lubricant Genie sells. I lubed the screw-type Genie for the
guy next door and he thought I was a magician for making his door work
so much better (and quieter).

--
Postulate a God who's so smart He designed things we won't discover for the
next ten years, but who's so incredibly stupid He couldn't think up the
theory of evolution. Duhhhhhhhh. "Damn, Darwin, what a great idea!"