3rd is right next to the main input shaft and most subject to any subtle bearing or needles wobble . Perhaps it's time for fresh needles and F&R bearings.My Tiger is very new on the road. A couple of times when in third and decellerating to take a corner it jumps out of gear. Never on acceleration or in any other gear. Will that be linkage adjustment?
Start with a simple external shifter adjustment. What feels fully engaged may not be.Thank you not happy about a strip down and rebuild after it has already had one