modem not reconnecting, data stops working - Xperia Z3 Compact Q&A, Help & Troubleshooting

i'm experiencing this problem since upgrading to marshmellow:
when in low signal areas i have a problem with the 3g/lte modem not reconnecting after finding a signal again. I can see 1 or 2 bars but data doesn't work. I need to flip airplane mode on and off. i'm on TMO, not rooted. Anyone else notice this?

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Intermittent data/wifi issues

I've been having some issues with the One coming gracefully back when switching cellular or wifi networks. Data connection seems to be lit up on top (blue Wifi bars and blue cellular bars), but I seem to have no data connectivity. Most apps fail for lack of data - I usually have to cycle airplane mode to kickstart it. Anyone else experience this?
Running stock ROM? Kernel?

[Q] Data Freezes - 3G/LTE Switching?

I recently updated to Kit Kat and flashed latest firmware and radio. I'm having a problem where data seems to freeze and won't connect at times. I can see the 3G data up and down arrows trying to connect, but it just never makes a connection. I can go into airplane mode and then back to service and it connects right away, usually to LTE, so I'm thinking it has something to do with the switch from 3G to LTE. Super frustrating as I drive around the city a lot for work and sometimes data freezes for 15 minutes or more. Anyone having similar issues?
ROM: SuperOneK
Firmware: 4.06.651.4
Radio: 1.00.20.1108
PRL: 55017
Same - Stuck on 3G for Data
I am having similar issue. I think it does have something to do with switching to LTE. My device now only really works with 3G. whenver i'm connected to lte no data is transfered but it says im connected and says data is transfering. I 've unfortunately resolved to just using 3G only. It's pretty sad. I went from a healthy use of data on 4G to barely using it. i think i had a few hundred KB this month. Any thoughts on how to fix this?
I also have this issue, it has been more and more prevalent lately. The phone will be working fine on 3G, then data freezes as it switches to 4G, maybe resumes for a split second, then switches back to 3G. Sometimes 3G doesn't even work then, sometimes it keeps looping between the two. It's ridiculously frustrating to be streaming music while driving and it just stops because it can't figure out which mode to be in.

Network drop issue

Noticed a couple of times that network drops and fails to rediscover even in places with very good network coverage. Worst part is that the icon shows network available. But calls/SMS won't come or go through. Only after you toggle flight mode does it gets connection again . Anyone else having similar issue ??

wifi having issues

have a wifi in the same room that phones and computer have no issue with and full bars.
but kf7 shows low signal and internet connect issue.
other wifi in the house shows good signal, but has constant "authorization problem".
any suggestions on how to fix?
stock, not rooted.

Question Wifi <-> Mobile switching?

I have this strange issue that has been with me almost since the beginning. I haven't been able to trace when it happens, but it now seems almost 100% of the time.
I only have WiFi in the house (wifi6, if it matters). If I go out, I only have 4G (I left only 4G and disabled 5G). I have no data until I put the phone into airplane mode and back, or I disable and re-enable mobile data.
Same thing when I go back in the house: no data until I disable and re-enable WiFi.
I've disabled the option for 'always-on mobile data' or similar, it's quite a battery drain if there's no cell signal.
Seems like a very strange bug, I don't have this with any of my other phones.
So you have both WiFi and 4G enabled and they don't switch seamlessly?
Exactly. I always have to restart each one of them, usually by toggling airplane mode. Was wondering if anyone else ran into this issue.
Ok this really is strange. There are 2(!) different toggles to enable data switching between WiFi and 4G, but for me it works flawlessly without them! As soon as I get out of my home WiFi range, 4G kicks in, and when I get in range again, the phone connects to my WiFi...
Hi, i have this problem too but it's not always.
I have a wifi 6 router too.
I also have problems switching from wifi to 4g. Need to toggle airplane mode on/off. 5g deactivated. No wifi 6 here.
I always assumed my vpn is causing problems during the switch to 4g. But hearing others have the same problem i would assume its zenfone problem.
I never had any issues in this area with my ZF8. With the option to have cellular always on I could walk out of my WiFi zone during a video call and no drop or short pause would appear.
With this off the network need a few second to work, and some apps need to be refreshed/restarted to gain connection. Never needed to toggle connection for this to work.
Maybe a reset would be enough or check for updates.
Ah, exactly! It does not necesarily need a network restart, but some apps just lose connection for a while, which can be from a few seconds to >1h. Which is even more weird as the icons are showing full connectivity. I would go out of the house, do stuff, come back later and I would only get the notifications when I'm back inside the house.
Rarely I had the connection drop completely (no signal) when switching, but I haven't noticed this happening since the last update.

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