IPV6 Failure

[Inyalga]

Hello
i require assiantce
So i used a netgear nighthawk modem for my gaming

but i noticed that it always bottlenecks the actual intended network 
When i turn it on its crazy good and overtime the gains just diminish
i recently switch to IPV6 on the modem and i was connecting it to my laptop via tethering
It worked for like 1 whole day
Today i had to go out so i ofc removed the tether and and took it with me

Now it wont work anymore with only using IPV6
So before it was set to either ipv4 or ipv4/ipv6

But i set it to ipv6 only and it was working way better more efficiently
but now a day later
and im getting
"no network" when i connect it to my pc
Idk what the issue is
and im tired of wasting money and not getting my network worth out of it
pls someone help
>.<

Or if thats not possible a way to stop this **bleep**ing network bottlenecking
im supposed to have 60more mbps than what i have normally it hurts

[plemans]

What actual device do you have? 

What model number is it? 

what speeds do you pay for?

What are you gaming on? 

do you have a screensnip of the cable connections page and event logs?

[michaelkenward]

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@Inyalga wrote:

im supposed to have 60more mbps than what i have normally

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If that is a WiFi connection, it will never deliver what you "have normally", whatever that means. It is how WiFi works.

But as @plemans says, we know nothing about your network. Indeed, it isn't at all easy to follow what you are saying.