Re: Game crashes after 15 min
@myBTSims Just as a test, please try playing in a clean user folder. Move your entire Sims 4 folder out of Documents\Electronic Arts and onto your desktop. When you launch the game, a clean folder will spawn with no content. Don't add anything to it yet; just see how a new save runs.
If it still crashes, let me know whether your entire computer crashes as well, and please also look in the Reliability Monitor for relevant entries. Hit Windows key-R and enter "perfmon /rel" without quotes. You'll see a list of errors and updates, with a column for each day. (Today is all the way on the right.)
For any errors that happen while you're testing in the clean folder, click "View technical details," then copy the information and paste it into a text document. (Notepad is fine.) You can attach the file to a post as you did with your dxdiag. Sometimes the Reliability Monitor doesn't update right away, so if you don't see any related errors, be sure to check back an hour or two. The timestamp on the initial chart can also be off by up to an hour, so that's not an entirely reliable metric, but the one within the technical details should be accurate.