Sony Xperia xz1 keeps restarting

My Sony Xperia XZ1 keeps restarting. And I know the reason: internal storage is full. This leads to restart of a working system. And restart-loop.
I'm pretty disappointed with software that came from Sony.
I'll try to use sony xperia companion to reset the device. Sad it works that way.
I was using it for banking, mail, authentication, payments. For that reason the device was not modified in any way (not rooted or so).

Mi Band, AmazFit Bip, etc.

I've been asked many times which is better: AmazFit Bip, Mi Band , samsung gear, ...
There is no simple answer as each product has its target. And so:

Amazfit Bip. My favorit.
Charge once per 1+ month (thus it is easy to lost the charger).
Has always-on screen (just look at it and check time/date).
Has bluetooth and vibrations.
Has GPS.
Waterproof.
Large screen.
Gorillaglass screen (but you still should use screen protection / frame).
Has alternative firmware (based on original).
Has alternative software.
Has physical button.

Closed protocol.
Chinese manufacturer.
Cannot track swimming.

Mi band 4.
Color OLED screen.
Charge once per 1+ month (thus it is easy to lost the charger).
Has bluetooth and vibrations.
Waterproof.
Gorillaglass screen (but you still should use screen protection / frame).
Round screen - looks fancy.

Must touch screen (or rise hand) to see time.
Touch-button will activate under shower.
Closed protocol.
Chinese manufacturer.
Cannot track swimming.
NFC only for chineese market.

Mi band 3.
Similar to Mi band 3 but worse screen and a bit smaller.
Has flat display.
NFC only for chineese market.

Mi band 2.
Similar to Mi band 3 but worse screen and a bit smaller.

Mi band 1.
No display (only 3 LEDs: color or white depending on version).
Pulse detection only in HR versions.

Amazfit surge and other.
Nice models. Some might have saphire glass (much stronger).
I would probably buy a polar/garmin instead for the price.

Apple watch.
Has many versions.
Need to charge every day.
A phone on your wrist.
NFC and apple pay support.
Physical button (more complex).

(Other) android wear watches.
Might support NFC (or not).
Need to charge frequently.
Getting a replacement charger might be an issue.
Might have a microphone - if you like to talk with your hand.
Some might have nice physical buttons.

Pebble.
Good, solid, old. Outdated.

Garmin / Polar.
Good for sport tracking
Depending on version - might last long on battery.

Cheap "smart band".
This is usually a crap. Usually needs to be charged frequently. No support. No updates. Bad quality screen. Glass will break eventually. Bad quality of measurements.
Meant to count steps and watch your sleep. Neither works well and you cannot track both (as you need to charge it).
Usually cost is similar to Mi band - so I wouldn't even bother looking at alternatives and would choose at elast Mi band.

Cheap "smart watch".
Needs to be charged frequently.
Glass will break eventually. Can be dangerous.
Often allows other to track you.
No support. No updates.
Avoid.


At the end some examples I have seen (and/or own).
Samsung gear. Costs a lot. You will use it for 2 weeks - then it will stay on the shelf.
Huawei whatever band. Might work for some time... until you see alternatives.
Anything with NFC... you might use it for NFC only.
Cheap OLED bands... that last up to 5 days on battery (and battery capacity drops to less than 20% after few months).
Go clever and its alternatives... is really nice but has too poor hardware (with 3k RAM you cannot do anything).