Yesterday i noticed that all of my temperature / humidity sensors have stopped saving their values in the history chart of the devices. Minutes and hours display nothing while all of them seem to have stopped displaying at the the same day (which i assume is the 22nd as there are no timestamps yet (thank you samsung!) . Here are some screenshots.
Evohome thermostat (cloud)
Aqara Temperature / Humidity sensor
Even the Smartthings button has this issue.