PPT idle time?
 

We have been noticing that what consistently happens when we leave the PPT talking for about 30 minutes and it is not being actively used the whole time (for example a participant walks in VR for 10 minutes, then leaves the room to fill out questionairres and then re-enters the virtual world) the ppt will stop talking even though the talk button has remained pressed the whole time. Is there a way to turn this setting off? It seems that after a period of idle time it stops talking....

Have you tried checking the Power Options of the PPT computer? It might be going into standby or hibernate mode after a certain amount of time, which could be interfering with PPT.

The computer is set to never standby. Anything else to check?