I haven't seen this subject discussed recently, but does anyone know definitively how the Back button works (or is supposed to work!) when watching a recording? The forward button is pretty good at jumping ahead about 30 seconds per press, but the back button is really flaky. I thought it was supposed to jump back about 8 seconds, which it *sometimes* does, but often it seems repeatedly to go back only a second or two. Then, one more press takes me back several minutes or even starts over from the beginning! Am I missing something about using this "feature?"