5ghz wifi not working

[Wigsta]

Since the last update my phone has had serious issues with 5ghz wifi. My router is set so 2.4 and 5 ghz wifi is on the same ssid so the phone can decide which to use. However, now, whenever my phone switches onto the 5ghz wifi, it stops working (exclamation mark next to the wifi symbol). My wife's Moto x play has no problems, and neither did my z3 until recently (since last update?)

Is 5ghz wifi currently broken in the z3?

Cheers

Bruce

[Uliwooly]

@DrWig

Could you check on safe mode

[Bhonder]

You could try to delete previous dhcp leases from your router.

Having the same SSID too tends to trick things, sometimes.

i have a similar issue with our MacBooks: they seldom connect to 5ghz (since a couple of updates) where iPads, other computer  and my Z3 compact never miss.

The culprit, I discovered, it's the router's firmware.

[Wigsta]

Thanks for the replies. This hasn't been a problem at all, until quite recently. It does the same in safe mode, and my wife's Moto x play has no problem using the 5ghz range, switching back to 2.4 when range is an issue (old double brick victorian house). I'll try deleting the dhcp from my router...... I'll report back 😉

[Wigsta]

P. S. 5ghz range sometimes works for a while, then stops.... But only on this phone!

[Bhonder]

Probably you already tried but it's worth to ask;

1) Forget and reconfigure network on your phone;

2) Check the channel of your wireless (but if you have thick bricks other's routers should not interfere);

3) Check the country of your router with some sniffer because it may deal with channel;

4) split SSID to see what happens;

5) Check the firmware of your router to see if there is an update;

6) Try with another router if you have it, or if a friend has one to borrow.

My case.

My own router E4200v1 and macbooks seldom clash since a couple of OS X versions, where z3, iPads and other stuff do not. Problems occurs during negotiations because E4200 sports an outdated firmware and our macs seems to be picky in that.

iPads seems to not care so, I guess, it's a burden between router's and Macs' wifi chip, respective firmwares, and negotiation code. 

My ISP branded (and brand new) router does not have problems in this way and macs are happy but, because  it's functionalities are trivial at best, I prefer to use my old router.

One day or another I will take a shot and install dd-wrt or openwrt firmware (probably dd-wrt) and see if my E4200 behaves. Maybe you could consider to do the same. Besides, if you have thick walls, consider that dd-wrt lets you choose the signal power beyond the cautionary specifications of the manufacturer. 

Which router model do you have?

[Wigsta]

Thanks for the tips.  Yes, I'd tried most of that.  There aren't many 5GHz networks near me (only one), and it's pretty far away, channel wise.  I'm also pretty sure it's a phone change, as it started happening in December (my Z3 updated in december also) and I never had any problems before then.  Currently, I've just moved the 5GHz signal onto a different SSID and not connected my phone to it.  I can add any other devices that support 5GHz to that SSID, but I liked the transparency of having them both on the same SSID so the devices could make the decision.

Thanks for all the input.

cheers

Bruce