We have two garage doors, both same age, around 20 years old. They are heavy wood 7ft x 9ft. Both have electric openers on them. Usually about once a year I need to lube up the hardware to keep them happy and working ok. I did this a month or so ago and things were ok for a bit but one of them was quickly back to straining to get up and down. The chain on the door opener is not lose, springs,etc all seem ok but it still strains at times, sometimes pausing for a second or two on the way down to push through whatever is holding it back. Going up is fine by the way. Any thoughts on things to look at to get it working again? I've told my wife to stop using that side until I figure it out. Don't want to over-strain the opener. I see that I'm about the last one on my street that hasn't replaced their garage doors with newer non-wood versions which I'm guessing are much lighter (all our houses were built around the same time by the same builder). No idea what those cost but should I be considering just doing that at this point? The panels in mine are a partical board material which are tough to maintain and are about due to be painted again as well.