I did try that. Tried same spot, different spot, resetting the bulb to factory settings, removing the bulb from the Alexa app, etc. Same result with every combination, any 6 of the bulbs will work great, but not 7 or more. I did read another user complaint where the echo folks told him there was a 6 bulb limit - but an update should be forthcoming that removes that limit. I'm just curious to see if anyone else has gotten more than 6 ZigBee bulbs to work at once. I purchased all these bulbs a few days ago when Amazon had the Sengled dimmable bulbs for less than $5 each. Maybe it wasn't such a bargain . . .