NEC-LIST: NEC 4.1 Anomaly

I have been trying to model an inductor in NEC 4.1, (code shown below)
single precision (NEC4S600). I have observed a disconnect of 55
micro-meters between segments 300 and 301 -- which is treated as an open
circuit (>0.001 of a segment length at 44 micro-meters).

Changing the number of segments, or the number of turns, by one or more,
corrects
the problem. Typically the segment end-points are within < 3 micro-meters.
I have not identified all conditions when this occurs, but some other
combinations
of segments, and turns, do produce a disconnect. I have not completely
investigated NEC 4.1, double precision, but it does run the code below with
no disconnect evident.
 
I have used Excel to compute the segment end points from the NEC output
file.
 
I would be very interested if anybody else has observed such an anomaly.

Frank Meredith

CM Inductor Calculation (NEC 4.1)
CE
GH 1 300 15 12 6 6 0.02015 0.02015 0
GW 2 3 6 0 12 0 0 12 0.02015
GW 3 6 0 0 12 0 0 0 0.02015
GW 4 3 0 0 0 6 0 0 0.02015
GS 0 0 0.025400
GE 0
EX 0 3 3 00 1 0
FR 0 5 0 0 3.7 0.02
LD 5 1 1 312 5.7001E7
RP 0 181 1 1000 -90 90 1.00000 1.00000
EN

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