I have a stored procedure that runs every night around midnight, and the main part of it disables a trigger, updates some of the data in the same table as the trigger, and re-enables the trigger again.
This has run absolutely fine every night for the past 4 or 5 years. However, for the last two or three nights, the disable trigger line seems to have locked the table up, as well as the task itself, so we've had to kill the task so that the users can carry on. It does not, however,appear to have run the disable trigger line successfully.
There's nothing else I'm aware of that's running at the same time that's blocking it (sp_who2 shows nothing is blocking the scheduled task, but it is blocking everything else using that table), but I've never come across this before either. We've not substantially changed the table in the last few days either, so I'm getting a bit puzzled!!!