I recently replaced a broken filament light bulb with a new (dimmable) LED light in a touch lamp on my night stand. When I touched it, it didn't work, but after unplugging the lamp and plugging it in again, the light was on. Upon touch, the light went out but again it was impossible to put it on again by touching the lamp. So now I have a lamp that I need to unplug/plug in to have it work. What could be causing this weird behavior? And is there a way to fix this?