MTU 0- doesn't solve the problem.
Whoever told you to change the MTU setting to 0 is causing a problem.
MTU = Maximum Transmission Unit.
What do you think is going to happen if you change the max transmission units to zero???
You're posting like we have background on your issue and we don't. Please describe the problem you're having. Also include details like what your router is connecting to and if an ISP, what connection type your provider uses.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.