Me too. There's also a post on reddit with a bunch of reports. It appears to be a bad firmware update. Two of mine are offline and the others all have pending firmware updates.
And this is a perfect example why local-only devices are superior for most of the HA user base. I'm shuffling around some z-wave sensors to cover for the most critical monitoring (refrigerator/freezer and leak detection), but this is gonna cost money to replace all of my Yolink sensors if they are bricked, but I might have to up the migration timeline to replace the Yolink sensors.
Unfortunately, that didn't work for me. However, the devices offline changed from seven to five, but the some of the devices offline now are different. I'm replacing yolink sensors at important locations with spare z-wave sensors. I had become complacent by using the Yolink sensors in imporatant locations, because they cost less, had great range, and were reliable, until today.
Yeah, I get it. I'd prefer if I had control over the firmware updates. Maybe with the local hub you can block Internet on the hub and just use LoRa? Every time I check though, it's sold out.