I often notice minor temperature differences between readings from multiple KE100 devices connected to the same T315 sensor. Typically, the discrepancy is around 0.1 degrees, which I understand may result from each KE100 taking readings at slightly different times. If the temperature is changing, this could cause the readings to vary, as each device may pick up the temperature at a different moment or when the T315 (or the connected hub) reports a different value.
That's not that concerning, as long as it gets updated over time, and generally when the temperature stabilises, it tends to show the exact same value across both temp sensors and KE100. Nevertheless it would be reassuring to see the same value across all connected devices.
The major issue I encountered today is that my KE100 units reverted to their internal sensors (at least I assume they did...), showing significantly different readings (one at 25°C and the other at 22°C), which clearly did not match the T315's data. I moved the T315 outside to an open window to check for updates. Suddenly, both KE100 units switched back to the external sensor, which was reading 17°C. Additionally, the temperature history graphs for the two KE100 devices were noticeably different during the night, so they must have been stuck in this state for a while.
There were no range issues reported, and all devices are connected, updated, and have fresh batteries.
I purchased these devices to create a reliable and "smart" temperature control system, not one that exhibits random and unpredictable behavior. This inconsistency makes it difficult to trust the system and leave it to operate autonomously.