Sorry to hear that you are having this problem. Since it started with the new Acer laptop, first try moving the laptop close to the T-Mobile gateway/router and use it there for a while. Does the Wi-Fi still disconnect when the signal is strong?
Also, when the Acer disconnects, please check whether another phone or computer connected to the same T-Mobile network remains online. If the other devices continue working, the problem is probably related to the Acer laptop rather than the T-Mobile service.
If only the Acer is affected, please try the following:
- Visit Acer’s support website and install the latest Wi-Fi driver available specifically for your laptop model.
- Open Device Manager > Network adapters, double-click the wireless adapter, select the Power Management tab, and clear “Allow the computer to turn off this device to save power.”
- Restart the computer and test again.
Please let me know what happens.