Hey @Ramprasad_Indarapu,
If workflow tasks are timing out it typically points to some scalability issue in your setup. In the example you posted above it seems to be ScheduleToStart timeout. This typically means the bottleneck could be on the workflow polling for workflow tasks. Can you try to run your scenario with multiple workers to see if that helps?
Here are some other posts which explains workflow tasks and how to interpret timeouts: