Ah, ok. I haven't had any problems with my Zeroes, apart from the first one which died I assume because I somehow short circuited it.
Here's one example of one of mine
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pi@raspi9:~ $ uptime
11:50:47 up 370 days, 5:47, 1 user, load average: 0.32, 0.34, 0.30
pi@raspi9:~ $ cat /sys/firmware/devicetree/base/model ;echo
Raspberry Pi Zero Rev 1.3
pi@raspi9:~ $ vcgencmd measure_temp
That one has been running uncased on a bare tiled floor and driving a WS2812 LED strip. It is covered in dust and the area does get damp.
Obviously it is not running Buster yet, but is on my list for upgrading.
I'm not using the HDMI out on that Pi, but I have run a Zero W for a few months with HDMI driving a 1080P monitor that was showing a status page updating every few minutes.