I’ve noticed a similar thing.
I had a 2005 Smart-UPS tower that never failed, but developed some transformer buzz that was annoying in an office environment—and hey, improved standby efficiency and an LCD panel would be nice—so I replaced it in 2013 with its latest equivalent. This one ran for about nine years and then started rebooting itself randomly, dropping the load each time. (It had no issues transferring and holding a load on battery, and self-test passed.) Its 2022 replacement now uses a non-standard USB-A male-to-male cable, is missing information that used to exist in the LCD menu, seems to have a problem charging from 98% to 100%, and has a broken event log (event 1 is always “Site wiring” and every other event is always “None”, even though there have been multiple power events, and there is no site wiring issue). It works, but QA issues are evident.
I’d previously tried a prosumer-grade CyberPower UPS (CP1500PFCLCD) on some other less critical equipment. When its battery failed after two years, it cut power to the load. When the charger failed a few years later, it cut power to the load. It died completely in about six years.
Tripp-Lite’s consumer grade stuff seems to work well enough for what it is, but their higher-end equipment seemed to all be designed for environments where noise doesn’t matter, which makes it a non-starter for an office. Eaton (their parent) seems the same.
So it would be great to know what is an actually good choice these days. At the moment I’m not in the market for anything and hopefully what I’ve got will run for another decade, but if it doesn’t, I have no good idea about what else to buy today.