Regarding your GPU problem, could you please post the output of qml.about()? Did you make any changes to your code?
Google Colab offers free access to a GPU but only in limited amounts so if you want something that will run on a GPU for many hours you will need to look at buying a GPU or buying a Pro version of a service that gives you access to one.
Make sure that you install and test everything as recommended here to rule out any installation or dependency issues.
If this doesn’t fix your problem please post your full error message.