Can you post your Hub status and logs? Someone should be spot if there is a problem Navigate to http://192.168.0.1 (or http://192.168.100.1 - if in modem mode) Don't log in! Click on 'router status' Copy/paste the data from each of the tabs. The forum software will remove the MAC addresses for you (you may need to click the 'post' button again).
Also, set up a 'Broadband Quality Monitor'. This will monitor the state of your connection and record any network dropouts etc - You can do this at ThinkBroadband (https://www.thinkbroadband.com/broadband/monitoring/quality) Give it a while to gather data and then click 'Share Live graph' and paste the 'Direct Link' into the forum!
I phoned up VM and to be honest I'm not particularly impressed!!
According to their script the resolution to the issue is to use a factory reset - So I did that (as to be fair its not something I had done) but I can't see how this will resolve a sync issue.
Then I mentioned about the speed, I ran 3 seperate speed tests using the Sam Knows real speed and got between 290 and 350 Mbps on my 1gig BB to the hub itself.
The VM representative then went on to say that the number of WiFi devices will reduce the speed drastically as the hub only supports so many, then she looked at how many Wifi devices were connected - Zero.
And I went on to say that regardless of how many or how my internet connected devices are connected it wouldn't make the internet drop out with sync issues and she went on to say that the pinhole reset will solve all that.
She went in and put some ofcom speed complaint in (I've never heard of this) and apparently my internet speed will be monitored for the next 30 days - So whatever happened to the Ooomph package service guarantee which I recall stated they'd send round an engineer the next working day (providing issue was reported early enough) to resolve any issues?
She said as the factory reset cures the sync issues that if it happens again today to call them back....So lets see