iPhone no headphones after 8.4 update

[bigdweeb]

I updated my 5s from 8.3 to 8.4 last night. I'm pretty sure I listened to something through the headphones after that but I'm not 100% sure since I did it late in the evening. This morning I tried listening to a podcast and the iPhone won't register that anything is plugged into the headphone jack! I tried several pairs of headphones, all with the same result, and the jack has no history of damage or failure. I tried rebooting the phone already, but that made no difference. I figure my next steps will be to back the phone up and try a factory reset. After that, I guess I can try to downgrade it to 8.3. Has anyone else seen this?