Live View won't connect on mobile

I have a ring door bell 2 all installed OK,But have isse with live view on my mobile, the WiFi router is right next to the door bell and all works fine when home got a minus 55 signal strength, when home live view loads on my android instantly, but when away from the home it won't load saying could connect and if someone rings door bell can't answer as won't connect, but will show me after they have left, my WiFi runs at 72mbps and my mobile data at 64mbps so no issues with speeds, I've reset the WiFi and installed the other ring app still no joy, when my.wife leaves the house she can access live view no problem she has I phone,, my phone is samsung galaxy s20 ultra so why is my live view not loading when away from home and not letting answer calls when people arrive, it did work the frist day I installed it now won't connect unless I'm home don't make sense Need help