I bought a 32GB Nexus 7 in January. Today I just noticed that I have only 8GB of storage left out of a total 11.8GB. My 32GB devices has just miraculously transformed into a 16GB one. Root Explorer, TWRP and the storage settings pane all display 8GB left put of 11.8GB. I don't know when this happened but it was in the last couple of days. My current ROM is SlimKat Stable 6. I am contemplating flashing the stock factory image, relocking the boot loader and returning it to Google.