Hi, stream relay is a cpu demanding process. Maybe your receiver overheats and crashes?
Can you watch the temperature over this 2 hour period to see if it gets too high?
Can you move the receiver somewhere else where there is more airflow?
I can't imagine any other reason why this freezing happens. I don't see any memory leak in the stream relay code.
Regarding t2-mi, can you give me a livelog from oscam-emu with debug level 4, please?
I believe there is something wrong in the way you have configure astra-sm to work with stream relay channels.