I've had this behavior on a physical dimmer switch and an ordinary cheap LED. It couldn't be turned off. Somehow the dimmer always feeds it some power, which the LED responds to. If that low power is at the edge of its "activation power", you're effectively rapidly turning it on and off.
This kills any LED. LEDs die from actuations far before they die from hours in use. Hue bulbs are praised for their reliability, so something is off.
In my case, I changed the physical dimmer into an ordinary light switch. That fixed it.