I’ve recently checked the O2 website to see if there is a lower supported bound for O2 HomeSpot plans (it works quite unstable at my case, regardless of a good LTE connection).
I found out there is a new 5G router for Hopespot possible. I wonder, if it is possible to get the older O2 HomeSpot router replaced with a new one. There are a number of known issues with the former one (you may find my posts for details), it is also not possible to try any other hardware (also discussed in a numerous threads on this forum).