LED flicker when dimmer at and near full brightness setting.
A Lutron dimmer has begun to cause LED bulb flickering at and near full brightness setting.
The dimmer switch has a brightness level setting slider at the right side of the on/off paddle switch. The brightness setting is usually set to maximum. Until now, this dimmer has been flawlessly controlling 6 small LED bulbs. Now, the LED bulbs are flickering at and near full brightness. The flickering isn't at a continuous frequency, it is sporadic. If I set the brightness to 3/4 or lower there's no flickering. I have "exercised" the dimmer level slider by repeatedly sliding it up and down between minimum and maximum then leaving it at maximum brightness but that hasn't stopped the LED bulb flickering.
What is the cause of this problem?