U2413, shuts down on its own

I'm posting my recent experience with a U2413 monitor (UltraSharp Premier Color), mainly because I was told my issue was "not a known issue."

I purchased this monitor in January of 2016. A few days shy of one year later, the monitor began turning itself off, then back on about three minutes later. During the "shut-down" period, you cannot turn it back on manually. It's as if someone pulled the power plug completely. When it comes back on, the on/off button lights up, along with the other button lights in a start-up pattern, then the Dell logo appears on the screen, then finally the monitor is back on.

I use this monitor at home, usually for a few hours after my workday and on weekends. I usually don't leave it on for more than a few hours at a time, only because I usually have other things to do. 

I contacted Dell and at their request, I connected to my Mac using a different cable (from miniDP to HDMI). The issue persisted. They then asked me to connect it to a different computer. Luckily, I still had my PC, but by this time it was late in the evening and I told Dell I would try their suggestion the next day.

The next day I connected the PC to the monitor and it was doing ok. I therefore concluded that the problem was my Mac. However, I later realize that my initial test with the PC had only been for a little over an hour - at that time, I had no idea how long it takes before the issue begins.  I now know that the pattern is as follows: the first shut-down occurs after approximately 90-120 minutes after being turned on, then again about every 20-35 minutes afterwards, over and over.

Once I understood the pattern, I was able to capture a shut-down and restart on video and shared this with Dell. I also shared the exact times of shut-down/restart during a marathon 5-hour session.

At this point, it was clear that this issue was monitor related and not any video card, computer or cable. Dell had me try a few other things, like factory reset and using different applications (at one point, Dell had suggested the problem was Netflix...??). The behavior seems to indicate that something internal is heating up and causing the power to shut itself off. It's not environmentally triggered, the monitor has been sitting alone on a small cabinet next to a window where the sun never shines on it.

As of this day, Dell has confirmed they will replace my monitor with a refurbished one - not ideal. My first Dell monitor lasted more than 8 years. It was still working well when I sold it, no dead pixels, though near the end it would take about 5 minutes or so to project at full brightness, which is why I decided to buy a new one. I was expecting the same reliability. Fingers crossed that this issue was one in a million.

As I mentioned at the start of this post, I was initially told by Dell that this is not a known issue. Can anyone confirm this either way?