YouView Guide no longer appears and unable to change TV channels

[zsc0re]

Very odd:

1. pressing 'Guide' on my remote opens live TV but the guide no longer appears.

2. pressing channel up or down, no longer changes channel.

No idea what is causing this.  I have to reboot/restart the TV to fix it. 

Anyone observed this before?  Seemed to start happening after the latest software update. 

Thanks.

[zsc0re]

Not sure on the root cause but I've managed to resolve this via 'Settings/Storage & Rest/Clear Cached Data' which was at 2.4GB. I then restarted the TV and I can now access the guide and change channels.