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Curious, the drop event with a 7.5 hour interval now for the same behavior. So you are referring to the modem/gateway you have is the prior generation 4G LTE version I must assume. It does sound like an external influence especially given the periodic nature of the event. Do you have any idea how strong the cellular signal is? Does that router/gateway provide metrics or just generic bars to represent the strength of the signal? You have the Askey LTE Wi-Fi Gateway? 

You might try using the chat from the marketing side of the T-Mobile business. At the top of the page the Coverage drop down has the option for Rural 5G & Internet. When that page renders there is a chat window presented at the bottom right. It will start out as a BOT and will ask you to login to your account. Once that is done you should see the option to chat with a live agent. If/when you get with a live agent via the chat. Explain that you are not satisfied with the T-Mobile solution you have and that you are considering another service. They will then probably direct your chat to a customer retention expert/agent. Then you can go a little more with the service being a problem and if it would be possible to upgrade to a newer gateway vs the LTE gateway you have. It might be service for the 5G is due in the area and the current information on the T-Mobile site is just not up to date with regard to your location. Having a text chat with a live agent removes the accent factor for an agent in another country. Maybe you will get lucky and get some answers that are positive. 

Without understanding of the area where you are and the proximity to the tower(s) or the strength of the signal it is really hard to say what is the best next action to try. If you have explored multiple locations in your home for the signal and found no better location I am not sure what is the next best step with that LTE router. The information I can see on T-Mobile’s site for the Askey LTE gateway is pretty normal but does not seem to suggest there are any metrics for the signaling. It sounds as if the signal strength may be weak but without knowing what sorts of speeds are possible or cellular metrics it is really hard to do much. If you have an Android cell phone there are applications that will provide metrics about the 4G signals. If you have an Apple iPhone it can be put into diagnostic mode to get cellular metrics reporting. It is rather confusing to someone not familiar with it but the metrics about the signal strength and quality and signal to noise ratio do provide some valuable information about the signal and help clarify expectations. 

You might try getting to a customer retention person via the marketing text path and see if they can offer an alternative to the older 4G LTE router. It is worth a shot.