There is package that you can install to see if there is any issues or something with the device, mostly people use it to check the stability of the wifi channels and devices.
luci-app-statistics
and maybe do a perf3 speed test. I ordered the kit but still need to wait until there is some stock so I can do test too.
https://openwrt.org/docs/guide-user/luci/luci_app_statistics