Lenovo T14s Wi-Fi speed decrease after some time

Hello,

I have lenovo T14s laptop, I use LTS version with Gnome. For some reason, my Wi-Fi speed decreases to 1-2 Mbps (both download and upload) after some time(maybe 30-45 minutes) and if I turn the Wi-Fi off and on again it becomes 100+Mbps as it should be. I have tried it in 2 different locations and result was the same, I haven’t tested with another OS, no problems if I connect via cable, no problems with my other laptop. What could be the issue?

My wireless adapter:

Network:
Device-1: Qualcomm QCNFA765 Wireless Network Adapter vendor: Lenovo
driver: ath11k_pci v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 1

Thanks.