Another Garage Door issue

[Meanie]

Garage door problems are on the rise and mine is experiencing another one.

This morning, the door went up and stopped about 3/4 open. I lowered it with the remote, then reversed to open again helping it along by pushing it up. When leaving for work, it would come down a partial way then go back up. I didn't have time to troubleshoot until now (after work).

This morning, I removed the center connector of the door to the opener for manual operation. Upon troubleshooting just now, the opener has a travel of about a 1 to 3 feet. I push the remote and it moves down, stops, then moves up on it's own. I disconnected the limit switches and tried again. The same thing happens. I increased up and down force but nothing. I know it's not the door causing the problem for many reasons but obviously, the main reason is it's disconnected. Therefore, it's in the opener itself but I have no idea where to even look. All gears, chain links, tracking, teeth, etc. are lubricated, intact, secure, etc. I'm dumbfounded. Any suggestions?

Thanks

[Frank]

Been a while since I've had any problem but occasionally light and detector might get misaligned causing problems.

[recyclebinned]

Did you check these:

[Meanie]

Which one? JK

Yes, cleared of any potential threat (spider webs) and both green lights are on.

[Hell Toupee]

Inspect the door closely while manually moving it to see if there's anything that could be putting strain on the door's movement in the track, such as a slightly bent door frame or a track out of alignment. That can cause the door to stick just enough to cause the opener to stop moving the door. If it's just a slight impediment, fiddling with the opener's force adjustor may do the trick. But if the opener needs a lot of adjustment to keep moving the door, don't rely on the force adjustment - fix the problem.

[recyclebinned]

Are they loose? If they move even for a split second the door will go back-up and you'll never know.

[Meanie]

As I stated, the problem continues even with the door unattached. I've been using the door manually until I can resolve this problem.