Spontaneous/random shut down, or crashing of phone?

[HRJ86]

So I've noticed on a few separate posting related to the same exact issue my Sony Xperia XA2 Ultra has a tendency of randomly shutting down or possibly crashing with no real exact way of determining why in the first place? I realize this may be a matter from previous users, and even possibly may have answers related to this, but I would like to know if in any way how to fix this issue besides sending it to repair centre if having to be a last resort situation.

So far I've factory reset the phone as mention with both on Sony FAQ portion and others, somebody had also mention shutting off the "Ok Google" feature on Google app which I've done but still found out some time during the night while asleep did shut off completely with having to manually start once again. In a previous posting that I found somebody had mentioned the idea of the SIM card may be at fault (possibly failing?) and pulling out of the phone's SIM tray to see what happens (which I haven't as that doesn't make sense unless your not going to use the phone for a long extended period of time) in order to see if a crash/shutdown is found present without the card inserted.

So other than maybe an issue with the OS on the phone (don't see possible unless a serious fault hasn't been found or address with update via Sony OTA or within Android?) I'm out of any other way to remedy this annoyance.             

[AlexandruRai]

Sadly it's the software... I test it in many ways too. Also signals drop and bluetooth is not always connecting. Plus in some regions Sony did not offer the latest upgrade and you might be forced to flash it for another region. A friend of mine bought the same device from another store and its upgrade is for Central Europe and cannot be upgraded yet. The latest software comes with many camera and sound improvements - still not the necessary ones. Look below:

Please Sony these...

[HRJ86]

As this may seem likely with this case it still baffles me as to why it's not corrected? I however don't suffer from either signal drop or issues with Bluetooth as not that long ago there was updated made available via OTA from sony (probably what your referring to) that installed, and no problems since that time so again - I'm at a loss for words. I'm not sure by what you mean with having to flash the phone to a different region in order for it to work correctly? I'm not sure if this helps but it's factory unlocked and used here in United States.

[HRJ86]

Just so you know it was the SIM card. Haven't had any random crashes since Sunday so you may have to reassess your information that you gave me earlier about the software being the issue.

[Milicom70]

Greetings, the same thing also happens to me: only after 5 days of purchase, when the equipment is unused, does it turn off (it never shuts off when I have it during use).
Support of SONY has made me pass some diagnostic test, factory reset and software repair with "SONY Companion" and nothing, remains the same, they say it must be a component problem. They said I should internalize for collateral. Now what do I do with a computer bought 10 days ago and already with repair ..?

[HRJ86]

So far the problem still is happening with mine also. I did the sim swap and it still does that, and I just recently exchanged different SD cards to see if that does anything, the phones been working for a little under 24 hours with no random crashing. Now now person has said that they sent their phone off and they did repair it as I'm assuming it was the actual logic board inside of the phone and remedy the problem but I don't know if this is actually been verified? 

[darkprime]

I bought one of these as an OpenBox from Best buy on 1/1/19.  It's been really nice but it too is rebooting randomly multiple times a day.  I have tried using it without a SIM and SDCard and it still reboots randomly.  Factory reset, latest firmware, disabling apps, nothing seems to fix it. 

[HRJ86]

It's been happening to a lot of people who own this particular phone I myself included. what I've come to find out so far is I have in fact removed the SD card that I was originally using which was 128GB down to a 32GB and it works perfectly fine I haven't had any issue with restarts or random crashing what I've come to find out. now I have been asking all over with anybody who may have a possible solution to this and so far there's been three theories on the matter: it's either a faulty SIM card it's software-related or hardware related. beyond that good luck trying to find an answer from Sony as they don't seem to care that much about getting this resolved but I think I would just wait until Android 9.0 comes out and see what happens with that then.

[tptg]

My Xperia XA2 also crashes regularly after the update to Android 9. I have did a number of factory resets but that did not fix the issue, but when I went on holiday and used a local sim card, the problem stopped and I had no more crashes/restarts. At home I have tried a new sim card from my present provider, but that did not solve the problem. I have again daily crashes/restarts. Can it be that Android 9 dropped support for older types of simcards?