Edge Explore 2 device, used with a number of sensors: Fenix 6 pro for wrist HR (I broadcast HR from the watch, not a separate cycling activity on the watch), a varia radar, a variety of Specialized ebike sensors.
The device starts a fresh activity just fine. All sensors automatically operable and doing what they are suppposed to. But....
If the Edge device goes to sleep, like a cafe stop or lunch break, whatever, with the activity paused, the sleep can be automatic or traiggered manually, the device will stop connecting to a random selection of the sensors, sometime one, sometimes another. Disabling/re-enabling a sensor can -sometimes- wake that sensor up, but only a small fraction of the time. Removing the sensor then putting it back doesn't help when it is in this state. It seems to make no difference if the sensors are continually on while the Edge sleeps, or the sensors are fully off, and carefully started up before the Edge device, or if the sensors aare powred on after the Edge wakes up. Once it's in this state, it stays that way until perhaps the next days, or the next full reboot of the device.
A hard reset and redoing the sensors makes it go away, until the next system software update, then the problem returns. This is recurring with each system software update for about a year now.
