Happens a lot. The last time it happened to me a few days ago and while it was extended I messed with the end of the arm and fixed it somehow, it then retracted in all the way. Something gets out of place and you have to reposition it while the arm is extended, sorry I didn't pay attention enough to know exactly what it was. I used to shove it in as well and it would just mess up again a week or two later.
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