Bot runs on your computer, so if you close your laptop or shutdown your computer it will stop working.
If your computer loses internet connection then bot will stop working as it will be unable to reach exchange servers to get data and place bets.
Also if your computer goes to sleep, hibernate or standby mode then bot will stop working.
If betting exchange servers are unavailable then bot will also not work and it will be unable to place bets.
If you are serious about betting then we recommend that you run bot on VPS or dedicated server to avoid most of those problems.