@Midlu May I have the model number of the wireless router? Have you tried to change the wireless settings on it, such as changing the wireless channel and channel width, security? Give it a go, then...

@Tony.K Hi Tony, thank you for posting on the TP-Link Community. You can try to update the latest driver and see if it helps:...

@AC1300 Thank you for posting on the TP-Link Community. Can you please kindly verify what is the system version of the Windows computer, is it Windows 7? What is the driver version for this T4U...

@Sergey_Miklukho Thank you for reminding. Does this beta firmware work for you? Do you have the speed issue with the C5400 v2?

@Sadik_Tamboli I see, please kindly confirm if the firmware I sent you helps, thank you.

@TallGuyNYC Thank you for posting on the TP-Link Community. Can you please verify how do you use the SSL sessions? What is the detailed network diagram/layout? Who is your ISP, please? What if you...