If your bot has stopped logging into Second Life, the most common cause is an expired subscription. This guide covers how to tell, how to pay, and how to get the bot back online.
How to Tell Your Bot Has Expired
Open the bot's dashboard page. If the subscription has lapsed, you will see the bot marked Offline with a red expired flag, and a Payment Required Renew Now link in place of the usual options.

Renewing Your Bot
Open the bot's dashboard page.

Logging Your Bot Back In
Once payment goes through, log the bot back into Second Life using either of the following:

Still Having Login Issues
If the bot still will not log in after paying, contact MoonBots support with the bot's name and your account name.