So I have an Older Craftsman 1/2 HP garage door opener. When the door goes halfway down it stops and goes back up. What i did notice when pulled the emergency cord to move the door down was the sensors lost power. They lose power at all intermitten spots but thats why the door is sent back up. The odd thing, the wires are connected to the wall, away from the track, and i made sure all the wires were tight at the back of the unit. YES the lights were solid, No the wires arent touching the track at all and I've looked to make sure all of them are not frayed or wiggling. The unit never loses power.... any idea?