Shifting issue

[Cormanus]

So ... my 2011 CB1100 is 13 years old, has more than 150,000 kms on the clock, is still going strong, and I have no complaints. Except, when it's been ridden for a while, and the engine is really hot, and the bike is stationary, it become difficult to shift into neutral from 1st or 2nd. It can also require more effort than when the engine is cooler to shift from 2nd to 1st when stationary. I also think that when this occurs there is the faintest creep forward when the bike is in gear: it can require more effort to push it backwards than when it is in neutral.

Does anyone have any thoughts or suggestions?