@Johnblack here's the beta driver for T4Uv3 the support gave me https://static.tp-link.com/2020/202006/20200608/1160648_0521_RTLWlanU_WindowsDriver_41_RegFastDMSWPeriod.zip It fixes the problem with...

The same problem. The 5Ghz now works with lag every 10 seconds. The lag goes away when I come close to router, but I need it to work as before, in my room! And can't rollback the firmware, this is...