Is called synchro's "baulking" - especially if you are trying to shift very quickly. Syncro's are failing to get the gears involved to speed-march (thats the "synconisation" part) and the gears flat-ar3e refuse to mesh ............... can also be accompanied by a "grinding" noise
Slow the shift down and let the syncro's do their job - at 100K miles they will be a bit "tired" (worn)
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