I've started noticing that my front and rear wheel aren't rear as stiff as they used to be; and I'm noticing this as brake rub that happens under load.
Can this happen over time? The wheel is still true (as far as I can tell); does a loosening of the spokes etc. happen over time which can cause this loss of stiffness?
If so, any tips on how to solve it? All the "how to true a wheel" Google queries seem to just give me instructions on truing a wheel which is no longer straight etc. not too much about restoring the stiffness of the wheel.