Its switching itself off after about 15-20mins. Any suggestions welcome. Thanks.
Take a closer look at the screwed power connector if it is really plugged in till the end. Some Plugs are a little bit bended, so the screw cap locks to early,
Had to fix the connector on my K2, too.
That can be different reasons.
1. Failed SD card, you can test without SD card for half hour and see if shut off again. or Change other new SD card.
2. The wire connection, please check the connection is stable.
More than that, can you check the DVR is not well protected that impacts the heat release.
Keep me updated after checking.