help with iMac and wireless connection

[Brizo1411]

Hi, first post on here and ive stumbled upon yous to seek some help please.

I posted this elsewhere but I've found this forum too and thought id ask

I have an iMac 2017 5k and i use virgin broadband in UK. The router supplied is a hub 3.0 for anyone that uses them and has any knowledge im in need of some help.

Ive been using this for around 1.5 years and had no problems via wifi, he router sends out a dual 2.6ghz and a 5ghz signal. He iMac started losing signal a couple of weeks ago and started playing up, becoming laggy, losing signal to my wireless keyboard and mouse aswell.

I called apple support and they had me do a fresh install on mac and wipe everything... and i reset my router. It seemed ok for a couple of days then started the wifi issues again, becmoning very laggy and not recognising my keyboard etc.

Reset router again and i noticed it would connect to one of the signals from my router (2.6ghz one) but as soon as i try to connect to the 5ghz one it crashes my mac.

My macbook has no problems connecting to them both via wifi and every other device connects fine to both of them.. just my imac

I ran a router cable from hub to my imac and it works fine, and dosent play up.

But as soon as i go back to wifi, its giving me issues.

Can anyone shed any light for me or had similar problems... ive spent a few days now trying to work out whats wrong and apple seem none the wiser and have booked me in to the genius bar this week.

I could live with wired connection, but i like operating sonos etc via imac and i cant now do this.

Sorry for the length of the post and hope for some feedback

thank you

 

[tehStickMan]

Sounds like potentially bad wifi chip, which has BT too probably.

Test by doing a hotspot on your phone.

 

[Brizo1411]

Works fine from hotspot pal... also fine when using Ethernet

Can’t understand why the computer totally messes up when trying to connect to the 5ghz signal off my router tho

 

[Fishrrman]

OP wrote:
"I ran a router cable from hub to my imac and it works fine, and dosent play up.
But as soon as i go back to wifi, its giving me issues."

Fishrrman's credo:
"Use what works for you, and ignore what doesn't"

That ought to provide my response to the quote above.

 

[mikehalloran]

If you can connect via Ethernet, why are you worried about wireless? Are you moving it room to room like a MacBook?

The most likely culprits are (a) interference in the 5K band (b) an antenna problem in the iMac (not uncommon)

The fix for (a) is to reposition the router, buy a more powerful one or buy a repeater for the one you have.

You can spend a lot of time and money going down this rabbit hole. Gigabit Ethernet is fast and reliable.