I'm a new fellow nokia & windows phone user and I got my first ever windows phone a few months back which was a Lumia 925. It came with wp 8.0 out of the box, i believe (or updated to it straight after turning on) and worked fine until the 8.1 came out and now my phone freezes mostly once per day. I usually leave it on standby somewhere, then come back to check it and i cant unlock it. If I had the clock thing on the idle screen then I could see the last time it was alive..
I just do a soft reset (power + volume down buttons for ~10secs) and it works fine again, but its getting pretty annoying. I havent missed a morning alarm due to this yet, but i feel like its gonna happen one day
Anyhow, has anyone had similar issues or know how to fix them? I'd really appreciate any advice.
Considering it only started after the update, I would suggest a hard reset from settings>about>reset your phone. Make sure you backup anything you need before hand.