Hi Franin, I have not, and I am guessing it is likely because I don't have a feature that you do? An automatic lens cover, which automatically opens when you turn it on, and likewise closes when you power it down?
While I don't yet have a troubleshooting solution, I'll keep my eyes out for you.
Well, the tap . . . hmmm . . . I have an idea, get anything that can record the sound, and record that tap when you fire it up. Link the sound file at the AVS thread, and I bet someone might know what it truly is. I am simply guessing on the auto lens cover. I suppose in the very worst case scenario, you can order the part, or perhaps even just remove it all together, though I would keep it until mechanical failure perhaps . . .