SURF-SOHO content blocking is on even though its off!

Hello, hope someone can help. I have a small network that I setup with a Pepwave Surf SOHO MK3 that, after working fine for ages, is now blocking access to facebook instagram, whatsapp etc. I cannot find anywhere that I have this on and its driving me crazy! When I move to a different network the same computer and browser can access them all fine so its not a firewall issue with Windows. Thanks for any advice!