Monitor going black regularly
The most common causes for these types of blackouts are poor cables, poorly shielded monitors or excessive environmental noise.

If you have nearby sources of EMI (electromagnetic interference), try moving these sources or the monitor/computer/cable. In practice I have seen for example 4G/LTE hot spots, burglar alarms, stereo receivers and other similar equipment cause blackouts.

The next step is to replace the cables with properly shielded cables of a good quality.

If that doesn't help, contact your the seller of the monitor for support.