It's a sign of poor build quality and shoddy soft parts. Might as well just tell you it's from not breaking in. Sewn-in leads are prone to actually causing fire. I have never burnt a tinsel lead myself and I abuse the crap out of woofers.
Not by a long shot.
OP, measure the OEM coil, if it's 3.180" OD, hit up Sundown for Z V2 recone kit. We have used that kit in LV5 and it seems to hold up better than the OEM DC parts.
DC has definitely changed parts suppliers in the last year or so and failures seem to be on the rise.