Depending on how many playlists and EPGs you have installed, the more TiviMate will store information which takes up space on your storage. If you have a lot loaded, you may want to do this monthly to free up storage. If you don't have many loaded, then once every two to three months will be fine.
Go to Settings/Appearance/Logos then scroll down to Clear Logos Cache and click on it.
Then go to Settings/EPG, scroll to the bottom and click on Clear EPG, then click on Update EPG.
Go into device settings, then to manage applications, go to Gethd.Live and clear the cache.
DO NOT CLEAR THE DATA, you will lose everything you've done and will have to start all over unless you have a backup file saved.
After doing these your app size on your device will be smaller and will save you some storage space.
Sometimes after deleting an playlist, the EPG will still be there, if you have deleted any playlists, go into the EPGs and make sure there's no unused EPGs remaining. Go to Settings/EPG/EPG Sources and make sure there are no unused EPGs remaining.
If you run backup of your Settings, which is very highly recommended, and store the backups on your device, use a file management app and check the folder you save your backups to. You only need to keep your latest backup, if you have multiple backups, you'll want to delete the older backup files because they are using a lot of your free storage space and you don't need them.
This would be a good time to also unplug your router/modem and streaming device, let them sit for about 5 minutes then plug them back in and let them reboot.