sears 1/3hp garage door opener problems

[bob]

hi,

I have three of these units lifting 8′ aluminum doors now for 7 years. They all are doing the same thing…that is they don’t always want to go all the way down w/o reversing back up. One door opener sometimes goes past the normal stop point and hit the safety stop and freezes up the unit. Any fixes would be appreciated, if this sounds like I should just junk the units, whose models would give me long term reliability performance for the right price?

Thank you,

Bob