Bill:
My guess is that it's clogged right where it drops out of the hopper onto the horizontal spinning plate.
I had that happen a few times with the feeder full, usually right after I've filled it.
I have it bolted down to a stationary "deck", so I kicked it a few times and that fixed the clog without me having to unload the stinkin' thing - it was full, so full that the food was over the top of the box that holds the timer.
My feeder is about the same age. The timer just recently went bad - first I couldn't turn a feed cycle off; I had to set the motor run time to 0 seconds. Next it wouldn't allow me to set the run time to 0, 1 second was all it would allow me to set. So, I called them and explained the problem, asking how much a new timer was. They said nothing - but you have to send the old one in for a replacement. Here's your RA number.
I took less than 2 weeks for it to get back to me, and I'll be installing it today.
I've had two other "problems" with it. 1) AquaMax 600 food will sometimes bridge over the hole in the bottom of the hopper, and 2) when I filled it with AM500, even on one second motor time and fan set on slow, it still threw out too much food. Greg sent me a block-off plate that reduced the hole size. I had to drill the hole bigger, but that solution worked perfectly -
and I didn't buy the feeders from Greg either. 3) The solar panel wouldn't keep the battery charged, but I have it on the North side of a group of trees and it doesn't see full sun. I adapted a much larger solar panel to it, and use a garden tractor battery now. No problems, even in 0°F temps.
I think the Texas Hunter Feeders are a bit more versatile in their feeding capabilities, and they are definately more user friendly if you have to work on the motor/fan assembly. But, until this gives up the ghost, I'll still keep on using it.