[X Style (Pure) General] Ohmster:
I had this problem too. Not from flashing this root method, what I did was take a deodexed Marshmallow rom from XDA and flashing that instead of waiting for "The correct rom for this device" to come, OTA, a couple of days later. This new rom forced me to format my extsdcard and totally borked my phone. I restored a Lollipop TWRP backup and ended up with everything the way it was, but NO WIFI! It was very strange the way the WiFi stopped working. Tapping the quick tile did nothing. Opening Settings, WiFi showed the little switch to turn on wifi and when I tapped to turn it on, it immediately snapped back to OFF as though there was a spring attached to it or something! I was devastated. A friend of mine figured out that the wifi radio was an Android 6.0 radio and not the stock Android 5.1.1 like it should be for Lollipop. Might be set to a different frequency or something. So he helped me flash the original Lollipop modem radio and it really worked! WiFi back to normal. When OTA came, IIRC, I took the update then rooted Marshmallow. Things are a LOT different with the right file, now Marshmallow is not so bad and I can live with it.

I will give file and instructions, but you must have newest Motorola drivers installed, along with the Android SDK platform tools with adb and fastboot. Google for that and find the instructions for it on the Moto X Play page.

NOTE: This worked for me in my situation. It might not work for you, read this post to see if the conditions are the same for you as they were for me. Use these files and instructions at your own risk. ALWAYS make a TWRP backup before trying anything like this if you can!

To fix it, I had a friend send me the factory image file for this XT1575 phone, United States. This is a zip file but you do NOT flash it! CLARK_RETUS_5.1.1_LPH23.116-18_cid9_subsidy-DEFAULT_CFC.xml_SHAWN5162.zip. To help you if you really need this help, I tracked down where you can get the file. The file name is the link to the page where to find it. It is a huge zip file, 1.27 GB, but you do not flash it, unzip to an empty folder. If you just want to fix the stock Lollipop WiFi, then do not follow the instructions on the page, that will delete everything and restore the unit to stock Lollipop. But if you need to, this is the way to go, it is the real deal for the original stock blur rom, so I highly recommend downloading it while you can still get it.

To fix WiFi, you need only one file from this zip, NON-HLOS.bin. Then you need a special bat file to run from Windows over your USB to phone to flash the WiFi radio back to Android 5.1.1. This batch file is NOT included with the original rom zip, it is called flash-modem.bat and I will give it here to you in code, copy and paste to a text file, save as flash-modem.bat in an empty folder with the NON-HLOS.bin file and run it with phone connected with USB cable.

flash-modem.bat

@ECHO Off
@Echo Test
C:\adt-bundle-windows-x86_64-20140702\sdk\platform-tools\adb reboot bootloader
fastboot flash modem NON-HLOS.bin
fastboot erase modemst1
fastboot erase modemst2
.fastboot reboot

NOTE: This file shows the path to adb on my PC. If your installation of Android SDK Platform Tools with adb are in a different location, you will have to change the PATH shown above to match the location of adb.exe on your PC. This: C:\adt-bundle-windows-x86_64-20140702\sdk\platform-tools\adb has to match the location of adb on your own PC.

If you are back to stock Lollipop 5.1.1 and ONLY want to fix the WiFi as described above, I will be a nice guy and put the two files you need in a zip and attach to this post. Download attachment, Flash-WiFi.zip to an empty Windows folder, hook up phone with USB cable, and click flash-modem.bat to restore your Lollipop 5.1.1 WiFi radio.

Arrrrgh! this 32.8 Mb zip is too big to attach here. I will do a Mega link for those that need it. This was a total MF for me, without this file, I would have to find that blur Clark stock Lollipop file and completely reset the phone to the way I got it. Here is your Mega Cloud WiFi fix file.

This works if you restored your Marshmallow to Lollipop again and lost your Wife, i.e.: touching the WiFi on switch in Settings snaps back to OFF. Happy New Year! :)