Here are some things you may want to do to troubleshoot the issue:

1. Check to make sure the power supply is plugged in to the laptop and a power outlet.
2. Check to make sure both ends of the cable are firmly and securely plugged in.
3. Check the power adapter and battery for physical damage.
4. Check if an automatic windows or driver update may be effecting your connection.
5. Check to make sure the laptop battery isn’t completely drained.