Hello, I have an ET430K and suffer from the widespread known issue where the screen goes black for a few moments, ranging from every few minutes to maybe 1 time per 15 minutes. Yes, I have tried different cables and inputs, both HDMI and DP. The problem persists. If you read on this forum and reviews posted elsewhere, it is a common issue.
This closed thread discusses the problem and has more than one product owner posting in it:
https://community.acer.com/en/discussion/546663/et430k-4k-monitor-the-monitor-goes-black-from-time-to-time-speakers-make-click-sounds-cut-out/Is there a way to find out from ACER the details of what causes this, so that I might take it to an inexpensive repair facility nearby to have fixed? This monitor is huge so it is not going to be worth the cost of shipping to ACER and back. I currently have TWO defective ACER products so this is not a very good track record. It would be nice if they could at least let me know what the known fix is, as the other thread linked above seems to imply exists.