A good 4G/LTE router for use in the UK?

[wild4gwonderer]

Hi all,

I bought an Asus 4G-AC68u 4G router so I could game and work without being locked down to an ADSL fixed connection.

However, I am having a not so great experience with it, it doesn't seem to like working with EE network (dropping connection) but other sim cards its working ok.

Any recommendations of a router I can use and take with me for gaming, work and media?