Yeah - That was a big deal. There was an actual recall over that.
Even on the new touchscreen receiver, this concern carries over. Every time the device is plugged in to charge, a nag screen comes up asking to do a audio check.
The first time we use the receiver for a solid week and we get zero alerts then I will certainly do an audio check.
I like using the receiver (either the old or new) during nighttime as a redundancy alerting device.
Although we have both a functional old receiver and the new receiver, I have been using the new receiver (as redundant) although the receiving device primarily used is the Apple iPhone with Apple watch.
Note: To avoid accidentally hitting the bug on the old receiver, I took the old receiver [far] out of range of the transmitter. Then hit STOP SENSOR on the old receiver. Then adjusted the transmitter id slightly so as to NOT be the actual transmitter id in use. At that point returning back to in-range was fine and no longer relevant. We then let the old receiver sit around for hours, powered up with wrong transmitter id before doing an [old] receiver power down and putting it on the shelf for long-term storage.