bandwidth limit on hostspot?

hello
I have some free hotspot (no limitations at all ) and a user show e today this error that he got

this is the hotspot configuration I have :

/ip hotspot user profile print 
Flags: * - default 
 0 * name="default" address-pool=hs-pool-1 session-timeout=1d idle-timeout=5m 
     keepalive-timeout=2m status-autorefresh=1m shared-users=60 
     add-mac-cookie=yes mac-cookie-timeout=3d address-list="" on-login=count 
     transparent-proxy=no

any idea what is this?
first time I see this
hotspotlimit.png