I’m starting 3 tasks and everything is ok. The tasks are doing their work as expected.
But after a while (maybe 20 minutes or 2 hours) one of the tasks stops working. (No idea what could be the reason… Maybe they do not come back from delay)…
From such a short description and no idea what your tasks are doing any suggestions will be pure speculation - have you gone through the items on the following FAQ page linked below, used one of the IDE plug-ins to see where your task is, or used the trace tool?