Nighthawk M1 lite set up and mobile app

Hi

Help needed

I initially set up the router and all seemed to work.

Today the router is connected but not to the internet.

I swapped sims because the other one kept locking.

Now - Its not connect to the internet and I cannot in via the mobile app . It kept going in and out and now won't login  at all

Can't get in via a PC either 

Tried resetting the router with the rest button but that doesn't work either.

Please help I am not a techie  but need to get this to work again

Thanks for your help

Joyce