Garage door began to open with a jump when I open in the morning

My garage door begins to open with one jumping when I open it after letting it closed long time (over 1 hr). The second or third opening right after first opening looks OK and very smooth. I checked the bottom rubber if it sticks to ground, but there is no problem. No balance problem. What point should I check now?
Thanks,
Jae
Reply to
JR

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