Question about food impaction

I have a yearling doe that has had a problem with food impaction. About 3 months ago she got and impaction and almost died from it. She lost weight so quickly from not eating, and then developed an abcess just above her cheek which we assumed was from the impaction. We got her back on the road to good health; gaining weight back quickly, eating great. Then 3 days ago bam...losing weight and both cheeks full. Had to dart her this time she was still too "lively" to clean out without darting. Cleaned out the cheek and the only noticable thing was a half broken acorn. Just to be clear, she ALWAYS seems to have food in her cheek. My questions are... Does anyone know what causes this and is there a remedy? I have a buck fawn that is starting to do the same thing and don't want to have this be a ritual. We only have 2 deer and do not have a chute so we would have to dart her everytime this happens since she will not let you clean it out occasionally. I am also wondering if we got the buck "used to us cleaning it out" would this help?

I have read that also. That it was caused by a worm. It was what I would not consider a reliable source so I figured I would ask the experts here. The article I read said it was usually not fatal though, and my gal would have definately died the first time so now I am completely afraid every time I see her like that. We cleaned her out 3 days ago and yesterday she had both cheeks half full. We have wormed her both times but not able to keep it cleaned out, thanks for that advice may have to do that.

Tom, that is exactly where I am right now. Has or did your fawn survived? She is tame but HATES us doing this to her and will not let us. That's why I am working on the buck to get him "used" to us putting our fingers in his mouth, in hopes he won't fight it when he gets older. The article I read said that the worm can be transported by horseflies, just an FYI for all, if this is true.