Playing Minecraft as normal could be for an hour or two or just 15 minutes then the game crashes completely and loses any progress that wasn't autosaved. I have left the game open for an hour in a loaded save without crash and usually, the crash is related to movement or input from the keyboard triggering the game to crash. I will attach the crash log and paste below, I would like to find the source of the crash as it has been preventing me from playing Minecraft for a number of versions since January 2019 and my initial thoughts are the 144 Hz or 1440P causing it since it started around the time I switched from my 60 Hz 1080P panel.
Crash log, and Game Settings are attached
Please check if that's still an issue for you in the latest 1.14.4 stable release or the latest 1.15 development snapshot.