Cuckoo (eero Pro6) broadband kapoot

Using Mobile Data for past few days and then last night I started seeing issues with certain APPs saying Not Connected, No Internet - type error messages

Weirdly some Apps work, but some don't and as per, the ones I use more often are in NOT category.

Few examples:

Chrome is allowing full access to all pages. But, it does state NO INTERNET CONNECTION along the top of the page. It does fall over when I try to open Google Account to check connected devices, etc.

Eero app is allowing access, but after I log into account and select START SET UP Button, it timesout and error states CANT DETECT MOBILE CONNECTION. 

Abs no doubt I have disabled something on settings or within Developer but unsure what and scared to factory reset in case i lose the lot as recovery email is old employer which i dont have access (daft I know).