Newbie: Rise & Fall of Sourdough, LOL
Well...note to self...don't turn the lower oven on to bake somthing while the sourdough in banneton's is in final rise in the upper oven! It apparently was too warm for the yeast and created a dry surface on the top of the dough both of which caused deflation. I figured , what the heck and baked it anyway. It still had enough rising power to push a little oven spring but has a flatbread shape. Haven't figured the picture upload yet but you can take my word for it.
Anyone asks, Yeah, I meant to do that!