Following up on your tip - towel dry in your bathtub or shower to prevent your floors or bath mat from getting wet. Helps prevent mold as well!

Try checking if your shampoo or bodywash has Sodium Laurel Sulphate. A lot of people including me are allergic to it, and it can cause itchiness. There’s a lot of options out there free of SLS, so try using products without it.

Have you monitored the temperature at all? If it shuts off after 1.5 hours of gaming, that sounds more of a heat issue than power. It sounds like maybe a lack of thermal paste.

Get something like CoreTemp and monitor your CPU temps while gaming.