hy jay
at 1st glance, pitch/spiral angle is way to aggresive, operation is more like a grooving/splining/or however you call it in english , and i would recomand c axis fur such
also, it may require a custom toolholder
your setup & code is ok for general threading, while in this part you don't even get a full revolution; it may not seem important to get a full revolution, because even when cutting oiling grooves a full revolution is more than enough, but in your case, the section is big, and even if you try to trick it with custom infeeds, it may not work, because a general threading insert is somehow perpendicular in the cross section, and this only applies for normal threading operations ( when pitch/spiral angle is normal ); when pitch/spiral angle is high, some other forces appear, that can be handled by a custom toolholder that keeps insert section perpendicular on pitch/spiral direction (+ custom cooling pipes), and also a code that uses G01 C Z instead of G71
all these is just a wild guess
for a more relevant idea, i need to see how&when the machine stalls on this code and tooling
for specific code, i need drawing and insert dimensions / kindly
ps1 : a quick fix should be a higher rpm and a lower doc, but this may break your insert
ps2 :
D0.005 U0.005 H1.04 : 200+ passes, that's definetly not 'common' threading