Problems with multiple single voice announvements: software bug?

I programmed in the menue "Single Voice Announcements"
1) Switch V01 ... Sensor Temp1
2) Switch V01 ... Sensor Temp2
Switch V01 is triggered by a voice command "Temperature" and it should cause the announcement of the values of both temperature sensors. Sometimes this works and sometimes not, depending on the kind of telemetry sensors and order of sensors. I changed the switch V01 by Sa for testing. It turns out that I get both announcements of temp sensors if I press Sa long and I get only Temp1, if I press Sa very shortly. This is a software bug in my eyes.