It means that there is nothing really obviously wrong with your machine,and since this happens after a couple or mins or hours the problem will be tough to pinpoint.
Hmm i have logs for gta 5 and it says its lost device when it crashes.
[2019-07-14 22:26:42.430] [WARNING] Device lost.
[2019-07-14 22:26:42.606] [DISPLAY] Reset succeeded.
[2019-07-14 22:35:31.793] [ ERROR ] HRESULT failed when doing m_device->Present(NULL, NULL, NULL, NULL) : 88760868
[2019-07-14 22:35:31.793] [WARNING] Device lost.
[2019-07-14 22:35:31.794] [WARNING] Resetting device...
[2019-07-14 22:35:31.794] [WARNING] Reset failed with D3DERR_DEVICELOST.
[2019-07-14 22:35:46.926] [WARNING] Resetting device...
[2019-07-14 22:35:48.414] [ ERROR ] GameComm: ReadFile failed.
[2019-07-14 22:35:48.525] [DISPLAY] Reset succeeded.
[2019-07-14 22:35:48.672] [DISPLAY] Game exited with code 0x1
[2019-07-14 22:35:48.673] [ ERROR ] Unable to stat out-file!
[2019-07-14 22:35:48.675] [ ERROR ]
****
[2019-07-14 22:35:48.675] [ ERROR ] * Setting error condition
[2019-07-14 22:35:48.675] [ ERROR ] * Category: 1 (ERROR_CATEGORY_LAUNCHER)
[2019-07-14 22:35:48.675] [ ERROR ] * Code: 107 (LAUNCHER_ERR_GAME_CRASHED)
[2019-07-14 22:35:48.675] [ ERROR ] * Extra:
[2019-07-14 22:35:48.675] [ ERROR ] * Localised: Launcher error. Code: 107
[2019-07-14 22:35:48.675] [ ERROR ]
****
[2019-07-14 22:35:48.677] [ ERROR ] Unable to read out-file!
[2019-07-14 22:35:48.679] [ ERROR ]
****
[2019-07-14 22:35:48.679] [ ERROR ] * Setting error condition
[2019-07-14 22:35:48.680] [ ERROR ] * Category: 5 (ERROR_CATEGORY_EXIT_CODE)
[2019-07-14 22:35:48.680] [ ERROR ] * Code: 1 (1)
[2019-07-14 22:35:48.680] [ ERROR ] * Extra:
[2019-07-14 22:35:48.680] [ ERROR ] * Localised: Grand Theft Auto V exited unexpectedly.