Unattended bot issues

I have an unattended bot that extracts data from a gateway folder and processes the data based on set expectations. I noticed on Friday that the logs in orchestrator said no transaction data and I assumed the bot was running fine, Since logs were appearing every few minutes. But agents raised a complaint that the bot was not processing any applications. It did not run for a few hours in the day and started working later in the evening. I was hoping someone could help me with possible reasons this could happen.