Python timer script stops before should

[ozstar]

Any help here please?

Is there anything in this script that would cause the stream to stop before the allocated time? For example the time.txt file has the time to start and run like this..
04-05-2020 09:30:00 40
04-05-2020 12:30:00 40
04-05-2020 15:30:00 40
04-05-2020 22:30:00 40
When I run the the stream manually not using the script, it runs the full 40 mins length however as soon as I use the script, it stops the stream a few minutes in. It is not any specific time, just a random time.

I see my two options are..
something in the script or
something going on in the PC background, although it doesn't do it when I don't use the script.

Please help and I am not sure where else to go as it does seem like a script or python event.

Thank you