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[SOLVED] Data connection not working properly

Hello, I got an xperia z three weeks ago and it has always worked perfectly until yesterday: I'm experiencing strange mobile data connection issues. I can surf the web but if I disconnect and connect again, the connection may freeze: the H icon (or g or e..) appears and phone seems to transmit data as it shows an up arrow but the down arrow never appears and I can't surf the web. Toggling data and airplane mode may allow me to connect successfully but it's always pretty random..
I started thinking it was a software issue.. So i flashed The phone with the utility twice.. No success. Carrier issue? Nope: it's all ok and apn settings are ok as I can use them. Hardware issue? Perhaps as I found out that removing the SIM card and inserting it back in a certain way could make the difference (higher rate of successful connections).. So what do you think? Could be the SIM card (I got a new one in December though), the phone or something I did not consider? Sadly I can't test a different SIM now but as soon as I can find one, I will try. Thank you!

Re: [ISSUE] Data connection not working properly
Does it happen while your using the device or when it's sleeping you turn device back on? I also have sort the same issue but with WiFi..
Sent from my C6603 using xda premium

R: [ISSUE] Data connection not working properly
It always happens regardless of the phone state..
Sent from my C6603 using xda premium

R: [ISSUE] Data connection not working properly
Ok.. I found out the cause.. It is the carrier.. They said itwas all ok but many are reporting my same issues in my country.. So not fixed yet but I can stop flashing my phone twice a day.
Sent from my C6603 using xda premium

[Q] Wifi and mobile data on at the same time

In my Abo the mobile data of a streaming app don't count for the usage. So the streaming app has an unlimited data amount.
When i'm in wifi, the stream don't work well, because my parents are using the wifi as well, and our router isn't the newest one So I would like to run the streaming app always through mobile data to save capacity in the wifi. Is there any way to do that ?
P.S. I have root.
P.P.S. I hope this is the right place for this thread
P.P.P.S. I'm sorry for my english

Just turn off the wifi when you open the streaming app, that are only two clicks
Sent from my GT-I9505 using XDA Premium 4 mobile app

Yeah I know that, but I want to use other apps simultaneously with wifi.

*push*

probably impossible, it will use one or the other when both are active, wifi takes preference over 3g unless the app itself has something to force it via 3g and bypass the wifi its unlikely

lazy wifi?

so my Wi-Fi gets 16 Mbps+ and my lte gets only like 1 at home however things like Facebook update images and videos much slower on Wi-Fi. and sometimes images don't load at all on Wi-Fi but on lte everything works as expected. no packet loss and better ping on Wi-Fi... so I don't understand what's going on
Sent from my 831C using XDA Free mobile app

Wifi slow with lte

I have a weird issue when connected to wifi and lte on in mobile networks my wifi speeds are slow,but when I pull the sim card or drop down to wcdma in the mobile settings it goes back to full speed. I am not sure if the sim card is bad or if it's something on tmobile's end anyone else have this issue. To test put the phone in airplane mode and turn on wifi and check you speeds it really noticeable in the YouTube app or instagram.
Sent from my SM-N910T using XDA Premium HD app

I get the same speed in plane mode with Wifi on as I do with LTE on. Maybe some router specs? Im only using Wireless N, so if you're using AC I can't perform the same test as you.

I am getting slow speeds but I have the At&t model. I'm only getting around 4-5 down and 20 up and I have 2 of them doing the same exact thing. Both my old Note 3's and my S4 active are pulling 15-20 down and 18-20 up every time. AC dual router 2.4 and 5.0

siturbo said:
I have a weird issue when connected to wifi and lte on in mobile networks my wifi speeds are slow,but when I pull the sim card or drop down to wcdma in the mobile settings it goes back to full speed. I am not sure if the sim card is bad or if it's something on tmobile's end anyone else have this issue. To test put the phone in airplane mode and turn on wifi and check you speeds it really noticeable in the YouTube app or instagram.
Sent from my SM-N910T using XDA Premium HD app
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same exact issue, when I am connected through wifi and tmobile LTE, my dl speeds are 120mbps and ul speeds are ~mbps, but apps in general take forever to load. I tested the same way you did, I turned on airplane mode and turned off wifi after and connected and it is super fast. I can't seem to figure out why wifi and LTE are so slow together.

I have a weird problem also, on WiFi at home I have full Internet speed on chrome and YouTube but on Facebook it won't load. But when I switch to lte data everything works properly. It's probably a WiFi setting but I didn't have this problem on my nexus 5 on WiFi at home
Sent from my SM-N910T using XDA Premium 4 mobile app

Try force stop beaming service and then check it out, as in my case it causes after it updates the beaming service

Has anyone found a fix for this issue?
My home wifi seems to cause massive lag for the bloatware version of facebook. Other apps have great speed and download times. However I have no issues anywhere else just at home. If I switch to 4G it runs just fine.

WiFi / Cell handoff issues?

Anybody experiencing WiFi/Cell handoff issues? After a while, I loose cell reception when connected to WiFi, it toggles on/off. When I turn off WiFi and turn it back on, it solves the issue for a while.
Sent from my XT1254 using XDA Free mobile app

Anyone?
Sent from my XT1254 using XDA Free mobile app

Fixed the issue.....
Went into the bootloader and cleared the cache.

I'm not sure if this is the same type of issues, but since the update, I've found that I can't receive MMS messages on my phone when I am connected to WiFi and a network extender. (I live in the sticks and get terrible reception without a network extender) If I turn off the WiFi, the messages send and receive without a problem. Any thoughts?