I love my iPhone X but Apple's refusal to fix the garbage that is iOS 11 is infuriating. My phone was perfect until they started pushing the iOS 11 updates. Now my phone CONSTANTLY lags and hangs. I have to lock and unlock the phone to fix it. None of the updates have made any difference. It's not a memory issue, I have a whopping 56GB used out of 256GB. For the first time ever I am very disappointed in Apple.
I’m really sorry you’re having such a bad experience, but your experience isn’t the norm among X users.
I’ve installed almost every public beta and final public release on my X since I got the X in mid-November. I’ve had a variety of minor issues but nothing as bad as what you describe. On a few builds, my battery life was reduced from the usual 9-10 hours to 6-7 hours—but only on a few of the (many) builds released since November. Other than that, issues have been very minor and not substantially out of the ordinary for a new and fairly ambitious iOS upgrade.
You might have already thought of this but in case you haven’t: consider backing up your X to iTunes on your computer, then completely wipe it, then update to the latest public release of 11.2.5, then reinstall your apps and data. Yes, I know that’s a pain, but if you haven’t tried it yet, there’s a very good chance it will solve your problems.
Otherwise, if there’s an Apple store within driving distance, make an appointment at the Genius Bar; if not, call Apple support. You absolutely should not be experiencing all the frustrating problems you’re having, and there must be a way to fix it.
Meantime, hang in there and best of luck to you.