Just to come back to my original question with a working solution.I removed the Snap Store version of TVH and installed the Michael Marley PPA found here.
https://launchpad.net/~mamarley/+archive/ubuntu/tvheadend-git
This version is 4.3.0 and is definitely working a lot more smoothly.It's got a few extras not found in the 4.2.x version. It's quite easily installed by adding the Michael Marley PPA,
sudo add-apt-repository ppa:mamarley/tvheadend-git
sudo apt update
You can then install TVH with the following command
sudo apt install tvheadend
Please bear in mind I am running this on an amd64 version of Ubuntu 22.04 LTS with a Kodi frontend and would definitely recommend it.It's had 8 updates in the last month so at least this PPA appears to be active.