First of all, I'm on Plusnet. Being part of the BT, I suppose there is a chance to get some help here.
In a nutshell, I am using the Smarthub router - smart is disabled btw - with 5Ghz and 2.4Ghz different names. Everything works fine and there's less lag when online gaming than with the Plusnet router. However, my Chromecast devices do not work anymore. Also, trying to pair other smart devices (air purifier, light etc) failed as well. Worth to mention that these devices worked using the Plusnet router.
I've tried to reset them, this didn't work. Restarting the Smarthub also didn't work. And what's worse, I cannot remember if all this started after I've switched to Smarthub or later (I might have done something in the settings!?).
So what can it be? Any ideas?
Try the Plusnet forum.
You should be able to get some advice there.
This is the BT Retail customer forum.
Well I am a BT product customer, ain't I ?