Solar Light Brightness Not Working

Soon after buying a set of solar lights, the brightness does not increase when it detects motion. I found that turning the schedule off and back on one or more of the lights fixes the brightness but I've had to do it almost every night. The lights are set to come on at dusk until 1 am. From 1am to dawn the lights are out but come on brightly if they detect motion, but only if I turn the light schedule off and back on. I called tonight and the tech support agent didn't seem to understand what I was talking about. She didn't know if it was a widespread issue when I mentioned another post describing the same issue on here. She said she had to "escalate" the issue and someone would call me back, but so far no word back. I was planning on buying more lights for my backyard but won't until I find out if this is a bug and if it will be fixed.