Unstable Wifi connection on windows 10 (high ping to router)

Hello CNET Community

so I moved to a new apartment where I am running a router with 2,4 GHZ frequency. The connection is stable on my phone and my other laptop but I my main Windows 10 laptop has some kind of issue. I recently did a reinstall of Windows 10.

Here is the issue: The signal strength is good, however from time to time (more often than not) I have incredibly high pings to my router. First I thought maybe it is interference, but it doesn't occur on any other device, plus I moved my laptop right next to the router and it still happens.

I reinstalled my wifi drivers (Intel Dual Band Wirless-N 7260, Driver Date 22.02.2015, Driver Version 17.15.05), which brought no change.
I played around with advanced settings (20 mhz only, Roaming Aggressiveness and Wirless Mode) which didn't help either.

On router side, changing the channel did not help, and sadly it does not support 5 GHz (don't tell me to buy a new router please, I know)

This is how it looks when I run a ping to the default gateway:

Reply from 192.168.0.1: bytes=32 time=1ms TTL=255
Reply from 192.168.0.1: bytes=32 time=163ms TTL=255
Reply from 192.168.0.1: bytes=32 time=446ms TTL=255
Reply from 192.168.0.1: bytes=32 time=406ms TTL=255
Reply from 192.168.0.1: bytes=32 time=165ms TTL=255
Reply from 192.168.0.1: bytes=32 time=169ms TTL=255
Request timed out.
Reply from 192.168.0.1: bytes=32 time=128ms TTL=255
Reply from 192.168.0.1: bytes=32 time=53ms TTL=255
Reply from 192.168.0.1: bytes=32 time=252ms TTL=255
Reply from 192.168.0.1: bytes=32 time=81ms TTL=255
Reply from 192.168.0.1: bytes=32 time=62ms TTL=255
Request timed out.
Reply from 192.168.0.1: bytes=32 time=2ms TTL=255
Reply from 192.168.0.1: bytes=32 time=198ms TTL=255
Reply from 192.168.0.1: bytes=32 time=113ms TTL=255
Reply from 192.168.0.1: bytes=32 time=329ms TTL=255
Reply from 192.168.0.1: bytes=32 time=836ms TTL=255
Reply from 192.168.0.1: bytes=32 time=518ms TTL=255
Reply from 192.168.0.1: bytes=32 time=392ms TTL=255
Reply from 192.168.0.1: bytes=32 time=3ms TTL=255
Reply from 192.168.0.1: bytes=32 time=2ms TTL=255
Reply from 192.168.0.1: bytes=32 time=2ms TTL=255
Reply from 192.168.0.1: bytes=32 time=264ms TTL=255
Reply from 192.168.0.1: bytes=32 time=1ms TTL=255
Request timed out.
Reply from 192.168.0.1: bytes=32 time=201ms TTL=255
Reply from 192.168.0.1: bytes=32 time=151ms TTL=255
Reply from 192.168.0.1: bytes=32 time=484ms TTL=255
Reply from 192.168.0.1: bytes=32 time=488ms TTL=255
Reply from 192.168.0.1: bytes=32 time=147ms TTL=255
Reply from 192.168.0.1: bytes=32 time=348ms TTL=255
Request timed out.
Reply from 192.168.0.1: bytes=32 time=228ms TTL=255
Reply from 192.168.0.1: bytes=32 time=474ms TTL=255

Slowly I do not know what else could be the issue.
I was hoping, that you folk out in the world wide web could help me with ideas or a solution!

Thanks