Hi, I am new to this (1 1/2 months ago was given my starter) made some lovely loaves of bread, but then we went away for 9 days, starter was fed and put in the fridge. Since coming back, I have fed it and it seems to be doing what it is suppose to until I bake the bread. The rise time is very slow and then it seems to flop in the oven, today it actually burnt in the oven (same temperature, same quantities, etc.) My starter doubles in volume 4-6 hours after feeding, looks healthy and smells healthy. I have no idea what I am doing wrong. Should I discard my starter and start again, or can I somehow revive this one to its former glory? TIA.