HELP audacity freezing for minutes with a simple deletion

I am using Audacity 3.0.2 on an Hp device with windows 7 I believe. PLEASE HELP!! This worked perfectly for recording and for the first 8 hours of editing and now it freezes every time I delete anything for minutes and then says not responding, but then will return to normal after performing the action. My file is not longer than 60 minutes. I am becoming very frustrated. Please help!!!

Thank you.

Try saving the project, then closing Audacity, then restart Audacity and reopen the project.
Note that the “Undo” history is lost when closing the project.
Saving the project may be very slow - be patient, have a cup of coffee or something, wait for it to complete.

Hopefully it will not be so slow when it is reopened.