2010 Kia Forte Koup SX sunroof

It's been almost over 2 yrs since I've opened the sun/moon roof on my Forte. Well a few days ago just to see if still in good shape, it stopped halfway. After 30min of looking around, I used compressed air nothing. I ended removing the entire sun/moon roof assembly. Wasn't hard. Just as I removed the aluminum frame, I didn't anticipate that the glass immediately drops down. Got lucky. I cleaned the entire assembly the track, drain/catch pan & ran 4ft of weed eater line as a drain snake on the rubber hoses then used compressor air to blow out left overs. Took me about 2hrs to fully clean check, & made sure the motor was working. I still wasn't able to find out what caused it to stop halfway, get stuck & not return to close. Now after the check up. It's 100% operational.