Finally I've seen my problem sorted... so far I did not have any issues with my wifi..
I rang VM yesterday to explain the problem and the technical support sorted it for me... dont ask which problem is coz they dont tell us... the only thing I know is that they restarted my hub twice.. had to stay on the line with them while they was sending some signals to my hub.
Same problem with my android phone and my son has exactly the same phone and he has no problem with his phone. His x-box on the other hand has problems keeping the connection. I'm fed up switching my phone off and on all the time. I'm sure it is the hub 3.0
Unfortunately yesterday the wireless back to the same again... dont know what's happening... wire cable it's fine but the wireless its weak.. problems with streaming sending messages on Instagram or messenger.. I'm fed up with this...