Thank you. I have 'Cisco Identity Services Engine (ISE) Authentication' ticked under splash page and everything worked perfectly till today...
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ps. Your are probably experiecing port block issues due to the switch spanning tree priority. If you forcibly make CSW1 the root (for example by giving it a priority of 0) and CSW2 the backup root (for example by giving it a priority of 4096) then it will probably be happier. You should do this anyway on your core switches for stablity reasons. https://documentation.meraki.com/MS/Other_Topics/Switch_Settings#Setting_the_STP_Root_Bridge
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It is typical for 4G carriers to run the default APN through a firewall and block new inbound traffic by default. Typically you need to change the APN to one that does not run via a firewall, or at a minimum, allows inbound traffic.
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