My H200 Hub updated to the latest firmware yesterday 1.3.6 Build 20240829 rel. 71119

Since updating I'm starting to see all my devices (C420 cameras, lightbulbs, T100 sensor, H200 hub) showing as OFFLINE and unreachable when I am out and about using a mobile network.
I'm in the same area as I often was before the update and have never seen this before so it looks like a new 'bug' may have been introduced?

The TAPO devices pick up again when I'm home but things were working better before the update!
I've just rebooted the hub in case that gives things a kick.

The firmware notes state these changes, but I'm seeing new issues as above: 
1. Optimized recording performance.
2. Enhanced device stability.
3. Fixed the issue that the LED keeps blinking red and green after rebooting in some cases.
4. Fixed some minor bugs.

Anyone else seeing this?