SSID no broadcast after leaving one hotel to another.
Go for a reset then.
Maybe some config is broken or depends on connection to some different SSID.
Well it is more complex than that seems like new (hotel) network has a 5ghz DFS and when networks created from slate ax using the 5ghz band that seems to be a problem. Turn the 5ghz band off and network is now visible only 2.4ghz. This sucks!
If you are using repeater, may be just lock to 2.4G or 5G and it should be fine.
Also make sure you upgraded the firmware.