One possible reason a recording can stop is tied to your video service subscription. If you have signed up for only one connection and while recording is going on, if you switch to a different channel, the recording will be stopped immediately. Also, if you have scheduled a recording that starts when you are watching another channel, the recording will not happen and it will show a recording with a length of 1 minute. After I upgraded to 2 connections from my service provider, my recording reliability significantly increased.
Nonsense.
It has to do with recording on the GTV via EPG. I have a subscription which supports 4 connections.
Manual recordings can go over 3 hours easily. Recordings via EPG almost never go over 1 hour.