Nightmare after changing broadband provider-HELP!

I have had a ring doorbell 2 and stick up cams for a few years. Changed ISP's (including full fibre), no problems. Moved house & old owner left BT broadband for a few days, everything connected fine. Changed to Fibrehop full fibre a few days ago and the doorbell + cameras no longer do motion detection or live view. They also keep going offline. Chime also does nothing. I split network into 2.4GHz and 5GHZ but didn't work. Connected doorbell to my phone hot spot and it worked fine. Bought a doorbell 4 thinking dual band may be ok, still the same problem. Ring support were no use. Broadband providers only suggestion was to split the network which I have already tried. I really like my ring devices and really need to some help in getting them working. Surely it has to be. problem with my new broadband? Any help desperately needed!