This may shed some light
http://forums.sv650.org/showthread.php?t=117027&highlight=gear+selecting
It might not be spot on but there are quite a few suggestions in there , my bike was being an Ar5e last week with dropping down gears , I found that my lever was really gunky and removed the footpeg assembly and cleaned it up and my Gear Selection was sweet as a nut , I don`t think it is anything too sinister as lots of people have suddenly sprang forth with this over the last 2 weeks which suggest a winter issue with maybe gunk and a bit of corrosion from salt etc .
Another one suggesting similar
http://forums.sv650.org/showthread.p...t=gear+problem