We've seen that one of our Technicians attempted to call you yesterday but no avail. Let us know your best contact time and we'll have them call you again, else you can contact our Technical Support hotline 131423, option 2.
Our apologies for the experience, we've seen that it is already past 6:30pm now. We'd like to arrange another call back for your account, may we ask for your other preferred time of contact for tomorrow?
Thanks for the update @nguyenm6, glad to know that out Technical Team was able to contact you on your preferred time. Another call back will be made for the connection follow up, we're looking forward for the stability of your connection.
It turns out that resetting the modem to the default settings has solved my intermittent connection.
Credit to the support of the TPG community with promptly referring to their technical team.