icloud drive has stopped responding

I just discovered that so many files are missing from my iphone10x "files" folder which is backed up to icloud. I logged on to the icloud.com and noticed many files are missing without any of my doing. Why did this happened? If I can't trust apple with my files who do I trust? This is so terrible as many of these files are not available anymore, I went I cloud.com and clicked "Recently Deleted" and saw so many files are in that folder. I clicked "recover all" and received the "icloud drive has stopped responding" message I am so frustrated as I don't know how to get my files back.