Phone mysteriously freezes then restarts?

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Windows Central Question

Been using my Lumia 730 for almost an year, with no major problems.

But lately it gets stuck at the lock screen, whenever I try to pull down the notification shelf, the phone hangs for a couple of moments then restarts. I can't seem to replicate the problem.

Doesn't seem to be due to any apps running in the background either. About a month ago, I'd reset my phone due to a minor SD card issue. Still runs as smooth as the day I'd bought it.

Any suggestions on how to fix the issue?