[Android Apps and Games] AnonVendetta:
[MENTION=5308112]raptorddd[/MENTION]: OK, I'll try to help you as best I can. I have no idea how to interpret logcats, so I can't help you with that. Maybe someone else can take a look.

But first, a few questions:

I understand that you say your bootloader is locked, but a quick Google search reveals that your bootloader can be unlocked. Is there any reason why you haven't done so (like for instance, wanting to keep your warranty intact)? Do you have a custom recovery like TWRP installed? If so, things will be alot easier, but if not, we can still proceed. Also, how did you manage to install TWRP (if you did so) without unlocking the bootloader? I don't think it is possible, since an unlocked bootloader is a prerequisite for being a to flash a custom recovery/custom ROMs. And how did you install Xposed? Google reveals that you probably had to flash it via a zip file, which requires a custom recovery. I guess you see what I'm getting at. It also appears that you have an ARM64 processor, like me.

The first thing I recommend to do is to reflash the stock ROM yet again. This ensures that you will have a fresh start. Try using an original LG KDZ/TOT when flashing, not a modded system.img. This may be the source of your issues.

Next, unlock your bootloader and flash TWRP (recommended but optional, only if desired).:

https://theunlockr.com/2015/08/23/how-to-root-the-lg-g4-t-mobile/

Install SuperSU and Xposed as well.

Go to opengapps.org and download the proper Google Apps zip for your device. I recommend selecting the ARM64, 5.1 and "Nano" boxes. Nano I think is best because it includes additional functionality that cannot be obtained from the Play Store (and which is not available in the Pico package). Extract gapps-remove.txt from the zip, then manually delete all the files/folders mentioned in that file. Double check after doing so. Then reboot. This will also remove Google's WebView and Play Store. Here is a link to a flashable Google WebView zip I recently created:

https://mega.nz/#!d0pTyBKQ

Encryption key: !WOzNCKNLhFPyIY_Ozfp2tfZ6n_PU3Txawg8CuS-aXD0

You can either flash it via TWRP, or manually copy the WebViewGoogle folder into /system/app (delete any old one). Set the permissions on the folders to 755, and the permissions on the files to 644 (which includes the WebViewGoogle folder itself). The whole point of doing the above is to completely purge Google from your device, so you will have a fresh start (with the exception of WebView and Play Store).

Also grab an APK of Play Store from apkmirror.com as well (but dont install it).

Make sure you've installed WebView before proceeding. Next you'll want to perform a factory reset on your phone. You can do this either from TWRP or from the appropriate menu option in your phone. This will wipe the data and cache partitions, while leaving the system partition untouched, so the Google Apps you removed earlier will still be gone. This ensures that any Google related files in /data or /cache will be wiped too. At this point you should have already rooted your phone and installed Xposed, and those will remain in place (as long as they are not the systemless versions of SuperSU and Xposed).

Next, install the FakeGapps APK I linked earlier. Activate it in Xposed and reboot.

Go to https://github.com/microg/android_packages_apps_GmsCore/wiki/Downloads. Grab the APKs for GmsCore and GsfProxy (and nothing else) and install them. I would use the official versions, but you can try the unofficial ones if you want. Do *NOT* install FakeStore or BlankStore (since you intend to use Play Store). Activate all options in MicroG settings and reboot.

Go to /system/priv-app and create a folder called Phonesky, set permissions to 755. Then copy the Play Store APK you downloaded earlier into this folder (don't install it like you would do with a normal app). Rename it to Phonesky.apk and set its' permissions to 644. Reboot.

Go ahead and log into PS, hopefully your issues will now be solved, if not, then I'm not sure what you're doing wrong (or maybe you're doing everything right and something else is interfering).

Hope this helped!