I'm having the same problem with two different model TP-Link routers serving as access points.
The wireless will randomly kick users off and then endlessly prompt for the wi-fi password. Entering the correct password will not allow people to rejoin the network. But everything else is fine. The wired LAN ports still work, as well as traffic between the unit and main router. The only way to fix this is to power cycle the units, or to re-save the wireless settings in the configuration portal.
I'm about to kill someone and have exhausted all solutions found on this forum, including: changing the LAN IP address to a different subnet, using different wireless channels, and enabling IGMP proxy and snooping. The wi-fi network name is simply alphanumeric, as well as the password.
I can't be the only one experiencing this, but I can't find any other suggestions online. TP-Link's technical support, while present, has been fairly useless. Does anyone have an idea or a hunch of what's going on? How can I possibly be so unlucky?
Model 1: TL-WR1043ND v3, running LEDE 17.01.2
Model 2: Archer C50 v2, running TP-Link firmware build 160801
One thing is for sure; I shall never buy another TP-Link product again.