These errors are never recoverable. Such situations are not covered by warranties. Your CAT should have a system name. The name may have to be repeated until the system can read it correctly. This lets you issue voice commands to bring the unit to an online state.
Many owners give their CATs a secret password as well.
You can also get the CAT's attention by booting the system. While this is effective, it is discouraged. Too much booting will abuse the system. The manufacturer is not responsible for injuries to the user. This is pre-installed.