Question: what to do when alexa says she is having trouble understanding?
Answer: #1. Wait a few hours and then try asking Alexa something again. ...  #2. Unplug the Echo device and plug it back in. ...  #3. Make sure Alexa is still connected to the internet. ...  #4. Ask Alexa to check for a system update. ...  #5. If all else fails, try a full reset of your Echo device.