Hi there and welcome
Can you remove the battery from the Panasonic and let it sit for 10 minutes.
then connect the battery, turn it on and try to download the films.
Let me know the results please.
To rule out the computer as the issue, can you try it on another computer and let me know if you still have the problem please.
ok, sorry I did not see anything about this in your description.
have you also tried a different cable?
Let me know the results please