well it can't be radius problem.
negative values shows when Mikrotik passes reached limit.
if i set limits 0 for user he gets unlimited data transfer.
What power supply do you use? Oryginal?
UPD: it's been working for 2 hours since then... And now again - hung up...
They can't get by IP. Every request lands at firewalls filter input and jumps to hs-unauth and is being rejected.Does DNS work at clients? If not, can they still go to hotspot page by IP?