Welcome to TPG Community, @ljc23!
Dropouts may be caused by a lot of things. They can be wifi droputs due to interference or weak wifi signal, or they can also be line dropouts caused by a fault in the network. Is this impacting all devices at home including wired connection (if available)? Do you happen to notice any changes in the light indicators on the modem when your connection drop?
You can check out these articles on how to troubleshoot wifi issues:
You can send us a private message with your customer ID or username so we can investigate this further.