Laptop randomly entering sleep mode while in use

Hello,

Yesterday I replaced the battery on my laptop, and since then it has occasionally gone to sleep at random while I'm using it. The screen turns black immediately without warning, and after a few seconds the fan powers down and the light on the power button goes off. I can quickly turn it back on and all my applications are still open, but this is obviously very disruptive. It happens while plugged in to the A/C adapter, and I haven't identified any pattern to how often it happens. I have already tried going into power options and disabling anything that causes it to sleep or hibernate, but the problem persists. The obvious answer is that there's something wrong with the battery, but I haven't seen the problem when the laptop is running on battery power alone. My laptop is an HP Envy running Windows 10. Any help would be appreciated.