I've been jailbreaking since the 3GS. I got the 6s this year via AT&T Next and jailbroke it last Thursday when Pangu released their tool. I rebooted many, many times as is typical when working on new jailbreaks and checking tweaks.

I got most things that were supported that I wanted on the device and things were working fine from what I could tell. Last night I go to bed and put my phone on the charger like every night. However, in the middle of the night I'm awakened by my phone being on, it's booting up. Okay, that's happened before on past phones, no biggie. Once it boots up it'll go back to sleep.

However, it never finished booted up. It just stayed on the Apple logo. I press the power button to no avail, the power and home button to hard boot but that makes no difference. I ended up having to DFU the device, restore the iOS from scratch and restore from iCloud. The worse news out of that is ALL of my photos were deleted from Photo Library! I'm not assuming that has anything to do with the jailbreak, just a highly unfortunate turn of events. Years of photos... gone. Fortunately Apple has a new tool that allows them to recover deleted pictures, whew!

In the meantime I'm not very confident in jailbreaking with the current tool now. I can't afford to have my phone become unusable out of nowhere or if for some reason it reboots uncleanly which happens from time to time. I know that this is anecdotal and I've not seen anyone experiencing this... although I didn't look closely because the jailbreak worked great for me!

Or so I thought...

EDIT: I just read about bypassing substrate to see if this was a tweak causing this before restoring but I didn't have time to dig through all of the discussions prior to restoring. I needed my phone back in working order.

However, this didn't happen after installing a tweak, just out of the blue. I wonder if anyone else has experienced that? I'd like to rejailbreak but this was the most catastrophic issue I've had and don't want to have to deal with it again. I understand there is always a risk with endeavors like this but still... I'm sure you understand. ;)