So they are not indestructible by any means...[/b]
I didn't say "indestructible" or "perfect", All products could require Repair services, the difference is the Frequency and Percentage of defective products.
Suppose a company buys 10 DMMs, after 3-years, we can see how many will be inoperable, and I guess Brymen won't last like Flukes and Keysights.
I'm sorry about your problem. The U1273AX has an interesting feature "-40 to 55 °C operating temperature", this is useful for outdoor work in Cold and Hot places, very few DMMs can operate in that range.
Fluke 87V, 289; Keysight U127XA, U128XA is "-20°C to + 55°C" and Altitude 3000m.
Brymen 869s is only "0°C to 45°C" and Altitude below 2000m!!! LOL