Failed to restore from

I’ve been working on an Android application in Google AI Studio for a few weeks now. Out of the blue, Ai Studio probably misunderstood my command and deleted all the source files!!! I couldn’t restore the previous step, it always said Failed to restore from… Now it worked, but after a while of work, the message I sent back then and based on which all the files were deleted appeared in the assignment by itself. And now it’s happened again! and again I can’t go back a step and it says Failed to restore from… I pay 23 euros a month and I really don’t like this!