Long-standing issue: the official HA Companion app for iPhone/iPad always eventually stops updating the states (it continues to respond but the states are obsolete and no longer updated). It has to be force quit and launched again.
Right now I’m on iOS 15 RC but this is going on for at least a year on officially-supported iOS 14. I had done a completely clean DFU reinstall of iOS 14.x in the meantime so remnants of old iOS install aren’t the cause.
HA version is Home Assistant OS 6.4 running on Rpi4, fully updated, currently on 2021.9.6. There are more bugs such as he app eventually stopping to respond to keypresses (of the virtual keyboard), but that’s probably a different matter.
Any clues? Thanks!