Does it happen from time to time or does it happen only when you try to start the service? It'd be helpful if you share with us more information about your deployment (the version of LAMP you are using, any change you made in the configuration files of the server, ...)
We have a Support Tool that will gather relevant information for us to debug the issue. Could you please download and execute it on the machine where the stack is running by following the steps described in the guide below?
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.