System UI keeps stopping XZ1

[leonday93]

My Sony Xperia Xz1 will only open with fingerprint. When I try to use the pattern it resets to lock screen and after 2 attempts a message pops up "system UI keeps stopping" and there are 2 options. Close app or app info. Both seem to reset to lock screen. Worried if the phone battery dies or resets I won't be able to open it (as you need to use pattern in this case). I'd rather not have to factory reset the phone. Are there any other solutions? Thanks

[Strampke]

If you don't want to reset try this:

Switch off the device. Have the battery charged.

Push the power button to start the device.

As soon as there is life, push vol-down and keep pushing vol-down.

Your XZ1 will start in safe mode.

If it starts up properly and functions properly there is a big chance that some self installed app is interfering.

Find the last installed few apps and delete those.

Then restart the device and hope for the best.

PS

I would consider doing a reset or a software repair with Xperia companion once in a while, say once a year.

It keeps your machine clean and makes it speedy again.

Find instructions about howto backup here and don't forget to click the links on the last line of the post.

[leonday93]

Thanks so much for the reply. Something to try if nothing else works!

I'm hoping to find a solution without turning the phone off as really worried when it starts up again I won't be able to open it at all (fingerprint does not work if it has been off reset). Phone works pretty well apart from that considering it's over 2 yrs old now.