Is the arm lift going low enough for all records? If not the lifter can usually be adjusted with a tiny little allen wrench.
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Oh well if its lead-in then its obvious. The program area of most records is almost perfectly flat but the lead-in area on some records is curved with a bit of a lip. So its possible depending on the angle and your anti-skate for the stylus to touch down in the flat area between the grooves, then "ride the curve" downhill at about the same rate as the lead-in groove, so instead of falling in right away its going along the flat surface a turn or three.
The only other explanations are dust or a sticky arm. I find it hard to believe slaw has a problem with either of those. He's too good. So it has to be the lead-in lip. I've had the same happen to me, just hardly ever, and I know what it is so no big when it happens.
There is not much downward force on the cueing device, to make it reach the full extent of its travel toward the surface of the LP (=VTF plus some mechanical advantage due to the location of the cueing device near to the pivot). In this case, the cueing device may just be sticking at some point before it hits the bottom of its travel, on the occasions where you notice. You might look into ways to lubricate it or maybe replace the damping fluid with something less viscous. The Alphason is decades old, so maybe new damping fluid is in order.