Reel it back in then have a helper slowly extend the slide while you check around the inside to make certain the edge of the slide isn't hanging up on a cabinet door knob (ask me how I know)..*s. If all is clear and it still doesn't go out fully, repeat the process while outside, under the slide looking for something jamming it up. Last effort would be to use the crank and manually extend it to see if it's the motor getting weak. Maybe others can chime in with other idea's.
2010 Cedar Creek 5th Wheel 34SATS "The Beast"
2006 Ford F350 Lariat 6.0L Diesel
2003 Harley Heritage Softail "Hogzilla"
1988 Harley Softail Custom "The Fireman"
1986 Marriage to "Wifey" (patience of a saint)