Might be best if you read the full post, I'm not clear as to your query;
When you are forcing the reboot of the Hub due to the drop in performance, can you advise exactly what is happening?
"Is the Hub rebooting itself for example, do you notice any lights change on the Hub? Does the wifi signal disppear from your devices or do you still remain connected? Is it a drop in speed?"
Broadband drops out, usually during peak periods, most recently Sunday 1th March around 8 pm. Not surprisingly the following fail to function;
iPlayer via Virgin TV box Build 4.37
Hive heating and lighting
NAS storage access
Landroid Workx mower
Dell laptop Internet
ASUS laptop internet
Thermomix TM 6
Repeaters / Boosters / devices remain connected to the VM 3.0 Hub but with no Internet access or functionality.
To restore VM broadband the VM 3.0 Hub has to be reset, switch off, wait 5 minutes then switch back on.
Hub re-boots and surprise surprise all the connected devices regain functionality except for the DECT phones.
Phones function with the BT landline, cable and cable adapter.
As you clearly state there is no problem with the broadband or landline service therefore the problem has to be with the Hub 3.0.
I stilk have no landline, have you organised the delivery of a replacement Hub?