[mythtvnz] Pre and post record extended times not always activating.

[Paulgir]

I have set the times that a recording starts and finishes,before and after  
the scheduled time, to around 3 minutes.
This worked fine on my previous install but on this one seems to be  
unreliable, finishing early when another recording starts immediately  
after another.
I have 4 tuners with multirec enabled (4 virtual tuners each).I don't see  
any conflicts in the scheduler.
I think I have probably missed a setting in the BE.Any suggestions what it  
might be?
The three options for input priority in BE setup I have set to 0  1 and 1  
for each tuner.

Cheers

Paul