So this just happend to me..

Using my wileyfox swift for a few days now and having a blast. This is the cheapest phone I ever got and i'm enjoying it
even more than my Nexus 4.

Today on the other hand, something strange happened to me.

Phone was working fine with a Samsung Evo 32 GB UHS-I formatted as internal storage.

Today I decided to move some apps from internal storage to the SD. I should have never done this..
After 3 apps the phone would stop moving them and stuck at 0%.
I thought this was just (another) android bug an rebooted the phone.
I moved 3 more apps and the same problem occurred.

This time the phone got stuck in bootloop at the wileyfox logo and a soft reset solved this.
When the phone booted I noticed 6 apps had disappeared, strange thing is. These weren't the apps I moved to my SD.
After opening the app drawer my phone froze completely, another soft reset was needed. This went on 5 more times, until I
removed the SD card. After this the phone started fine.

I checked the SD in my laptop and it was only showing the folder "Lost.dir".
When trying to format the SD card it was only showing a option to format it to 16MB.

After this i used Windows build in "disk manager" and noticed that there was a second (and main) partition of 16MB on the
card(?!).
After removing this partition I could format it to the original size.
It took me 5 tries before the phone would format it to use as internal storage. It would force close 4 times before with
an error message.

Can't find anything related about this issue on Google, is this a known bug?

TL;DR: Moving apps from internal storage to SD f'ed up my SD partition/card. Can't find anything about this issue online.

Phone info:
Wileyfox Swift
Cyanogenos 13.1.2, latest updates installed.
Not rooted, locked bootloader, nothing modified.