On mine (Honda HS55) it turned out to be gummy old grease on the shaft and the lever that are supposed to lock the auger lever down. The spring couldn't overpower the sticky old grease. If nudged or given enough time, it would slowly turn and lock, but not instantaneously, as it should.
10 mm wrench to remove the nut (bottom left) and bolt (under handle) holding on the metal cover.
Once cover was off I could see the locking lever, spring, and the shaft that had the gummy grease on it.
The third photo shows the locking lever as it should be engaged. I had to push it to engage it, due to the spring not being strong enough for the gummy grease on the shaft.
There are flat sides on the shaft, behind the threads for the nut that has already been removed. Use a wrench on those to turn the shaft out. Disassemble. Clean. Oil. Reassemble. Works great now.
Another possibility is that your locking lever or spring are broken.
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