I think the developers need to add a confirmation window when selecting/ticking the "Downloads" checkbox under 'Clear Private Data'. It's really stupid having it marked/checked by default as it removes downloaded files from your device. It should not be marked/checked by default. I have long wondered why my files are being removes every now and then, not until recently I discovered that clearing my private data was the cause to the issue. This needs no further explanations. Implement this as soon as possible.