[bug] Network coverage drops and recovers every few seconds [not relevant]

asked 2016-01-26 23:12:19 +0200

DrCheeseCake gravatar image

updated 2016-02-05 13:17:56 +0200

Sorry if this has already been covered in a previous post, but I had a look and I can't find anything similar.

I have recently experienced a problem where the network drops completely and then reconnects every few (maybe 10?) seconds and continues to do so until I reboot the phone. This unfortunately drains the battery. The only time it doesn't happen is when the mobile internet is connected and the wifi is off/no wifi network is available. I thick I have ruled out the carrier as a reboot solves it (signal is full bars 3G where I live).

I have also noticed that when it enters this state, the notifications that would normally pop up to tell me it's connected don't happen. Does that mean it's something to do with the software that manages the network connections?

As I sent it back recently, I first thought it could be hardware related, but it sounds to me more like a software problem.

I factory reset the phone a few days ago (to try and solve this problem) and I'm currently running (Tallojärvi) [early access].

Any help would be greatly appreciated.

Update 31/01/2016:

After further investigation, this problem only seemingly occurs when the phone tries to switch from 3G to 4G (ie. it tries for 4G but fails and switches back to 3G). Sometimes though 4G works perfectly fine. Next I'll check whether it is location dependent, which could suggest a network problem. The provider claims everything is fine though.

In the meantime, is there a tutorial somewhere on how to diagnose network problems on my Jolla, so I can rule out a phone fault? At the moment, choosing 'Prefer 3G' in the 'Mobile network' settings seems to cure it, but it's not the ideal solution. Any help would be appreciated. Cheers.

Update 2 31/01/2016:

Think my issue might be related to this: https://together.jolla.com/question/126545/4g-data-fails-connect-workaround/

I've now worked out that:

  • If I open a mobile internet connection with 'Prefer 3G' enabled and switch to 'Prefer 4G', the phone switches to 4G without a problem
  • With 'Prefer 4G' enabled: If I disconnect the mobile internet whilst in 4G, the phone is happy to jump from 3G to 4G and vice versa.
  • With 'Prefer 4G' enabled: If I disconnect the mobile internet whilst in 3G, when I get back into a 4G area the phone drops network coverage for a few seconds (presumably it's trying to connect to the 4G network) and then switches back to 3G.
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The question has been closed for the following reason "question is not relevant or outdated" by JoHe
close date 2017-09-09 13:24:25.053726


I just found this post describing exactly the same issue I've had since upgrading to (Saimaa).

Like the OP, I have also found that leaving the settings as "Prefer 3G" seems to mitigate it. 3G is better than an unreliable network connection over 4G, but it is a pain not to be able to take advantage of 4G when my phone and carrier both support it.

@DrCheeseCake - I notice you are in the UK as well - which network are you using? I'm a Giff Gaff customer, so am connected to the O2 (Telefonica) network. I don't know enough about how mobile networks to know if that would make a difference, but it might help those who do know to establish a pattern.

tochi ( 2016-02-11 11:26:34 +0200 )edit

I'm in the UK and also using Giffgaff. I always set the 'Prefer 3G' despite being (apparently) in a 4G rception area - but my SIM is not 4G ready.

Only after updating the OS, does the app then choose prefer 4G on my behalf, which results in no network found. So, yeah, set I stick to 'Prefer 3G' and don't appear to have any problems.

Edz ( 2016-02-11 12:19:27 +0200 )edit

That's interesting @Markkyboy. For clarity: I do have a 4G ready SIM, but am getting the same issue.

tochi ( 2016-02-11 15:05:04 +0200 )edit

Interesting! I'm also with giffgaff. Definitely a common theme then :). Just to clarify: I'm on (Taalojärvi) pre-release.

DrCheeseCake ( 2016-02-15 16:13:51 +0200 )edit

I still have this issue and I would prefer to have 4G working. Does anyone know how to debug this (eg. by changing some settings or checking a log file)? @tochi@Markkyboy Did either of you get this resolved?

DrCheeseCake ( 2016-06-13 17:21:29 +0200 )edit