[primaeval]

I suspect it is the source of the stream being unreliable.

Check in the jobs folder to see if it is actually trying to record for the correct length of time.
userdata\addon_data\plugin.video.iptv.recorder\jobs
In the .py files look at line 5
cmd = ...
The '-t', '830' argument is number of seconds is will try and record for.
See if that is about 3600 for an hour program. It will add the start and end offsets to the program length.

It doesn't look like you were watching anything else at 21:08 but if you were it could overload your android box and cut off the stream.

Recording internet streams is notoriously unreliable especially at peak times of the day and if your device is busy. 

The t para,eter is correct, nobody where usimg the androi box, but of curse you are right about the peack time. I will try in different hours.
thank you again 

I did some more tests and I discover that if somebody try to watch another stream in my account the recording stops. This doesen’t happen if I record by the IPTV extreme application. There is a way to increase the retry or buffer size of the plugin ? Thank you 

There used to be these ffmpeg arguments to help with bad connections but I took them out because they didn't work with someone's version of ffmpeg.
-reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 300
Add them in
Settings \ Jobs and Rules \ Optional extra ffmpeg arguments