topic Re: Xperia 1ii disconnects from 5G to 4G+ in 1 Series

Xperia 1ii disconnects from 5G to 4G+

aaljuma — Fri, 14 Aug 2020 17:49:18 GMT

Hi, I've been using the phone for a while. However, the 5G network doesn't seem to connect. It does when you swap the sim card with a different one, and after 10min it goes to 4G+ for some reason, and it's stuck there until you swap the sim, and the loop keeps going. It never seems to stay 5G.

Yes the phone is in it latest update.

Yes the SIM can connect to 5G. (tested on other 5G devices)

Yes I have a 5G plan.

Yes I have tested this while literally standing under a 5G node.

Yes my service provider supports the 5G bands of the Xperia 1ii.

Yes I've tried multiple sims.

Yes I have contacted my service provider, and they say everything seems fine from their end of things.

Yes I have restarted, and factory reset my device multiple times.

Nothing seems to work too keep my 5G phone stay connected to 5G.

Re: Xperia 1ii disconnects from 5G to 4G+

RottenFoxBreath — Fri, 14 Aug 2020 18:23:01 GMT

If its not stable, it'll drop to the next stable network speed.

What selection on network settings/preferred network, do you have picked?

In my city, 3 and Vodaphone state stable 5G but it's spotty on both, to be honest, it's really bad.

o2 is the best, which I went for, even though the others say theirs is fine, it's really not.

Re: Xperia 1ii disconnects from 5G to 4G+

aaljuma — Fri, 14 Aug 2020 18:44:47 GMT

I have a WiFi Mobile 5G router to test the connection. That seems to have a more stable connection in the same spot than my Xperia phone. Actually it’s consistently connects to 5G.

I’ve got the Preferred Network Type to: 5G/4G/3G/2G

Re: Xperia 1ii disconnects from 5G to 4G+

Jess.09 — Mon, 17 Aug 2020 11:44:56 GMT

Try to select the preferred network type to 5G only, from Settings → Network & Internet → Mobile network → Preferred network type. Select 5G only.

Re: Xperia 1ii disconnects from 5G to 4G+

aaljuma — Mon, 17 Aug 2020 13:14:24 GMT

Hi @Jess.09

I’m afraid there’s no 5G only choice for some reason.

Re: Xperia 1ii disconnects from 5G to 4G+

RottenFoxBreath — Mon, 17 Aug 2020 13:19:50 GMT

Totally different from my options.

Re: Xperia 1ii disconnects from 5G to 4G+

aaljuma — Mon, 17 Aug 2020 13:22:15 GMT

Interesting 🤔
Obviously we don’t have the same experience using the same device. Hopefully someone from Sony can help clarify what’s going on here.

Re: Xperia 1ii disconnects from 5G to 4G+

Jess.09 — Tue, 25 Aug 2020 08:23:43 GMT

If the 5G network is not stable, it will automatically switch to other networks.

Try to contact your operator again, they may be able to help.

Re: Xperia 1ii disconnects from 5G to 4G+

MJ_QaTaR — Tue, 08 Sep 2020 11:59:10 GMT

Unfortunately I have the exact same problem and yet to find a solution.

The 5G network is strong, using other 5G devices I can get an average of 480 Mbps download speed, while being at the same spot I can only connect to 4G+ with my xperia 1 ii.

And it used to work, flawlessly with 500+ Mbps download speed but it stopped working all of the sudden. I did all what @aaljuma did, still couldn't connect to 5G network.

Re: Xperia 1ii disconnects from 5G to 4G+

Jess.09 — Wed, 09 Sep 2020 10:58:31 GMT

I believe that depends on the stability of the 5G network in your area, if it is not stable it will switch automatically to other networks.

Did you try to contact you network operator?

Re: Xperia 1ii disconnects from 5G to 4G+

MJ_QaTaR — Wed, 09 Sep 2020 12:19:06 GMT

Thank you for your reply @Jess.09 .

It's not in my case, as I have elaborated earlier that using a different devices in the same location gives me 5G connectivity, and I did contact my service provider and they confirmed nothing is wrong in their part. I have tested on multiple devices (Huawei Mate Xs, Huawei 5G mobile WiFi pro, Samsung Galaxy Note 20 Ultra)

All of them in the same exact spot and all with 5G connectivity except the Xperia 1 ii. And I tried multiple places too.

So it's not the stability of the network. It's the device itself.

Re: Xperia 1ii disconnects from 5G to 4G+

Jess.09 — Wed, 09 Sep 2020 16:19:57 GMT

I see, and what happens when you try to select the network mode to (5G only), do you get this option in the phone settings?

Re: Xperia 1ii disconnects from 5G to 4G+

RottenFoxBreath — Wed, 09 Sep 2020 22:06:28 GMT

Who is the operator, and where are you located.

Re: Xperia 1ii disconnects from 5G to 4G+

RottenFoxBreath — Wed, 09 Sep 2020 22:06:52 GMT

who is the operator, and where are you located.

Re: Xperia 1ii disconnects from 5G to 4G+

MJ_QaTaR — Tue, 29 Sep 2020 06:00:11 GMT

I apologize for the late reply.

The options available are:

- 5G/4G/3G/2G

- 4G/3G/2G

- 3G/2G

There is no 5G only option.

It is strange as it was working fine and very well.

Re: Xperia 1ii disconnects from 5G to 4G+

MJ_QaTaR — Tue, 29 Sep 2020 06:06:33 GMT

I apologize for the late reply.

My operator is Ooredoo and I live in Qatar. The 5G coverage is strong here.

Huawei and Samsung 5G devices work fine with strong signal, My Xperia 1 ii used to work fine with 5G it's only recently that it's not connecting at all.

Re: Xperia 1ii disconnects from 5G to 4G+

CosmicTomato — Tue, 29 Sep 2020 13:01:18 GMT

What changed before this happened? a new app maybe or an update?

Re: Xperia 1ii disconnects from 5G to 4G+

Strampke — Tue, 29 Sep 2020 23:22:07 GMT

Did you test in safe mode?