It’s probably your internet provider does not allow tethering. Tethering is being detected while not permitted and turning off. Yes Easy will probably work…I Just set it up on GL-MT300N-V2.
Follow my instructions here to set it up…
Then to hide tethering you may also have to change the TTL. Very easy. Just to firewall custom rules and paste this command at the bottom. It worked for me. The advantage of Easytether is that is you’re not using the regular USB Tether which may alert your provider. But that’s not it…some provider use TTL check to detect tethering…That’s why you will need this in firewall custom rules.
iptables -t mangle -A POSTROUTING -j TTL --ttl-set 65