Been having a bit of a think on this whilst lying in my sleeping bag staring at the ceiling on a 3 day adventure ride this weekend...
96-97 seem to be susceptible to 3rd gear "whine".
I've ridden 3 that have it including mine.
The whine is caused by loosing the hardening?
Suzuki re-harden the gear making it more brittle?
2006 Suzuki re-re-harden/fix the 3rd gear.
Of the 12 bikes in the list <98 and >05 are conspicuous by their absence.