Why does my Bravo 15 shut off during games?

The Eco-Silent detail is a useful clue. If it only happens when the laptop is allowed to draw more power, check the power path before chasing drivers again: use the correct-rated adapter, inspect the cable and connector, and note whether the battery percentage or charging behavior changes under load. A failing adapter, battery, or internal power component can cause a hard cutoff.

70–80°C on the CPU and GPU does not rule out a thermal problem. Those readings may miss brief spikes, and other components, such as power delivery parts, can get hot without appearing in the usual monitoring overlay. If you can, log temperatures and power readings right up to the shutdown, and check that the fans and vents are clear. Avoid repeatedly stress-testing it if the cutoffs continue.

A full instant shutdown is different from a typical driver crash, so I would not spend much time reinstalling the same graphics driver again. Check Windows reliability history and Event Viewer around the shutdown time for clues, but a generic unexpected-power-loss entry only confirms that Windows did not shut down cleanly. It usually will not identify the failed part by itself.

Since a technician repasted it, I would ask them to recheck the cooling assembly and power-related hardware rather than assuming the paste job settled it. Mounting pressure, contact, fan operation, or a disturbed connector can matter. The fact that lower-performance mode stays stable narrows the conditions, but it does not prove whether the cause is heat or power.