OneDrive deleted thousands of my files?

I'm hoping somebody here can help me, because I can't find any kind of "Support" link just for OneDrive. Yesterday, for no reason I can determine, OneDrive (personal) deleted a couple thousand old files of mine and put them in the Recycle Bin. I was not using even half of my 1 TB storage, and I did not delete these files myself. They were in various folders. Some had been accessed very recently, some had not been accessed in years. I looked for the files on the app on my phone, on the website, and by trying to find deleted files through apps on my phone (i.e. I looked for a deleted Excel file and it was not found). They were all different file types - Excel, Word, PDF, pictures. I cannot figure out why it did this, and I haven't been able to find any documentation of a known glitch. Has anyone else had this happen?