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Might sound silly but I took my bike into the dealer yesterday for the same reason.
I have about 8700 miles on the tires.
the tech, after he took it for a ride showed me that the tires were cupping on the left side causing the problem.
Another high pitch noise can be a final drive belt not properly aligned to the final drive sprocket. This will happen more as the bike gets up to temp.
I don’t see where you listed your model, but in the event it’s a touring, I’ll throw this at it;
Broken rear exhaust support bracket right above the starter motor, towards the left side.