Some LED bulbs state "not dimmable"; yet dim on test. Are they hurt?
Buy hurt, I mean shorter life, or other problems. The dim-nest seems to be less than before; but it is significant, and in my case desirable.
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Sounds like they're battery is running low. Its not usually a problem but you may prefer to replace them :)
I believe I've seen LED dimmers, but your not supposed to use the standard dimmer. http://www.popularmechanics.com/home/how-to/a3886/how-to-use-a-dimmer-switch-with-cfls-and-leds-15882096/
A standard dimmer uses pieces of the wave to allow the incandescent bulb filament to heat to varying levels of white hot. LED output is not based on heat and requires a more complex dimmer (hence the cost). Upgrade your bulbs and install the proper dimmer. You'll get rid of the flashing/flickering/etc, and have a much more usable lighting fixture. I put 4 cans in my living room ($6.50 x4) with four dimmable LEDs ($8x4) and one dimmer ($18) all from Lowe's in about 7 hours. Looks like daylight at only 60W :D