As a SOHO device, I don't think it can support 50 tablets connected wirelessly. 20 connections is a very good performance indeed. ;) If you need more, you may try add 1 or 2 access points in your...

SSID disappears, as well as WLAN LED? Do a hard reset and see what happens. Besides, uninstall antennas on it to reduce sensitivity and ensure it is not caused by wireless interference.

Here are some notifications. It may helpful to you. http://www.tp-link.com/en/support/download/?model=TL-WDR4300&version=V1#tbl_j

Jesus, what a pity! Then PA511 is damaged with a wrong firmware. I'm afraid you need to purchase a new one. A quoto from their website, Wrong firmware upgrade may damage your device and void the...

TL-WPA281 can be set up with same SSID and security settings as your router but different channels to avoid interference. Please have a try. It may disconnect and reconnect automatically when you...

I think you will get a better answer and suggestion from your xbox's technical support.