My LG90 keeps crashing

[Alicia_n]

A few days ago my Phone just restarted and did a system update without asking permision, since then my LG L90 (LG-405n) has a couple of issues
- When I am using my Phone it can Crash, no button works, not even holding the powerbutton for 30sec.
-When I try to restart it will not restart till I remove both my SIM-card and my SDcard (16gb)

Is this something to do with the software update?

Extra info:
- I my Phone only for WhatsApp, Chrome, YouTube, E-Reading (Moon+ Reader) and CoK
- I dont let my battery charge drop below 15% and dont charge it more than 94%

 

[belodion]

Welcome.

It may be worth backing up your personal data and doing a Factory Reset. Let us know if you need advice about doing those things.

Also, SD cards sometimes cause trouble.

 

[Alicia_n]

After a long time on the boot screen i get a message fastboot_init() and lastline it says UDC_Start()
After some digging I found out that my Phone is 'Soft Bricked'
How is this even possible?

I have Lollipop 5.0.2