I'm having some major problems with my 2 week old Metz as paired on my month-old E-PL2. Up until last week, it was working find, whether it's TTL or wireless TTL. All of a sudden last week, it doesn't always fire properly (sometimes proper exposure, sometimes way overexposed, sometimes way underexposed) even when I wait 5-10 seconds between shots. I changed batteries and everything, too. I tried switching around Auto, Program, Aperture priority, Shutter priority, and Manual. Same thing. Then today, I was trying to cycle thru the Manual mode in my to shoot different light strength. All of a sudden, it doesn't fire at all, even in other modes in Wireless TTL or on the hot shoe. Finally, I pressed the green lightning button and that made the flash go off again, but with the same exposure problem. Furthermore, sometimes, when I turn off the unit, the Power button would blink red for about 5-10 seconds. Should I return the unit or is there something wrong in the way I'm using it?