this is my post on the HP support forum for the elite x3:
So I got a hold of HP suppot today and it was not easy.
First off, the online chat feature had me waiting #1 in the queue for over 2 hours. I tried calling but the Elite x3 wasn't listed as an option. So after being on hold for way too long, I called a different product's department and the guy there transferred me to someone who finally helped.
Good news HP is trying to make this issue right. I think it's related to the SIM card. I don't know how many of you are on AT&T but that is my carrier. Although I replaced my SIM card last week, and have a 2nd replacement x3, the phone continued to freeze randomly, but consistently.
I was told to start eliminating variables since they're not really aware of this issue. Keep calling and make them aware. First step, do a hard reset, flash your device using WDRT, get the AU for the latest Windows Mobile build, and DON'T LOGIN WITH YOUR MICROSOFT ACCOUNT. DON'T INSTALL NEW APPS.
YES IT SUCKS BUT DON'T DO IT. (unless this is your only phone I suppose)
For me, this kind of defeats the purpose of having the phone but whatever I'll try it. Currently, I followed all those steps, and am running the device as it came from the box with the latest firmware and OS updates. I will only use it for calling and texting and see if it freezes over the course of the next few days.
HP speculates (as did Microsoft) that maybe there was a bad batch of phones that had an error with the SIM card tray and something is causing this problem along with the SD card problem.
If you do have AT&T, the guy also suggested trying out a T-Mobile SIM card to see if the freezing stops as it may be a carrier issue not supporting the phone. Again, kind of defeats the purpose of this phone if I have to go out of my way to obtain a different carriers SIM. And why that would make the phone freeze is beyond me.
I will update any findings I get or that are given to me by HP support. I have linked them with posts from this forum as well as Windows Central forums to make them more aware of the issues.
Hope this helps.
***ALSO***
if you find a solution, please share it. HP and the rest of us having trouble would love to know.
Thank you!